Delete bundled copy of NSS and replace with README.

patches/nss-urandom-abort.patch

-diff --git a/nss/lib/freebl/unix_rand.c b/nss/lib/freebl/unix_rand.c
-index c9674ea..e0d8f58 100644
---- a/nss/lib/freebl/unix_rand.c
-+++ b/nss/lib/freebl/unix_rand.c
-@@ -917,8 +917,19 @@ void RNG_SystemInfoForRNG(void)
- #if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
-     || defined(OPENBSD) || defined(DARWIN) || defined(LINUX) \
-     || defined(HPUX)
--    if (bytes)
-+    if (bytes == SYSTEM_RNG_SEED_COUNT)
-         return;
-+
-+    /*
-+     * Modified to abort the process if it failed to read from /dev/urandom.
-+     *
-+     * See crbug.com/244661 for details.
-+     */
-+    fprintf(stderr, "[ERROR:%s(%d)] NSS read %zu bytes (expected %d bytes) "
-+            "from /dev/urandom. Abort process.\n", __FILE__, __LINE__,
-+            bytes, SYSTEM_RNG_SEED_COUNT);
-+    fflush(stderr);
-+    abort();
- #endif
- 
- #ifdef SOLARIS
-@@ -1135,6 +1146,11 @@ static void rng_systemJitter(void)
-    }
- }
- 
-+/*
-+ * Modified to abort the process if it failed to read from /dev/urandom.
-+ *
-+ * See crbug.com/244661 for details.
-+ */
- size_t RNG_SystemRNG(void *dest, size_t maxLen)
- {
-     FILE *file;
-@@ -1145,7 +1161,10 @@ size_t RNG_SystemRNG(void *dest, size_t maxLen)
- 
-     file = fopen("/dev/urandom", "r");
-     if (file == NULL) {
--       return rng_systemFromNoise(dest, maxLen);
-+       fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
-+               "Abort process.\n", __FILE__, __LINE__);
-+       fflush(stderr);
-+       abort();
-     }
-     /* Read from the underlying file descriptor directly to bypass stdio
-      * buffering and avoid reading more bytes than we need from /dev/urandom.
-@@ -1165,8 +1184,10 @@ size_t RNG_SystemRNG(void *dest, size_t maxLen)
-     }
-     fclose(file);
-     if (fileBytes != maxLen) {
--       PORT_SetError(SEC_ERROR_NEED_RANDOM);  /* system RNG failed */
--       fileBytes = 0;
-+       fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
-+               "Abort process.\n", __FILE__, __LINE__);
-+       fflush(stderr);
-+       abort();
-     }
-     return fileBytes;
- }
-diff --git a/patches/nss-urandom-abort.patch b/patches/nss-urandom-abort.patch
-index d5f55c8..e69de29 100644
---- a/patches/nss-urandom-abort.patch
-+++ b/patches/nss-urandom-abort.patch
-@@ -1,62 +0,0 @@
--diff --git a/lib/freebl/unix_rand.c b/lib/freebl/unix_rand.c
--index 579040e..2f9b3e5 100644
----- a/lib/freebl/unix_rand.c
--+++ b/lib/freebl/unix_rand.c
--@@ -916,8 +916,19 @@ void RNG_SystemInfoForRNG(void)
-- #if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
--     || defined(OPENBSD) || defined(DARWIN) || defined(LINUX) \
--     || defined(HPUX)
---    if (bytes)
--+    if (bytes == SYSTEM_RNG_SEED_COUNT)
--         return;
--+
--+    /*
--+     * Modified to abort the process if it failed to read from /dev/urandom.
--+     *
--+     * See crbug.com/244661 for details.
--+     */
--+    fprintf(stderr, "[ERROR:%s(%d)] NSS read %zu bytes (expected %d bytes) "
--+            "from /dev/urandom. Abort process.\n", __FILE__, __LINE__,
--+            bytes, SYSTEM_RNG_SEED_COUNT);
--+    fflush(stderr);
--+    abort();
-- #endif
-- 
-- #ifdef SOLARIS
--@@ -1134,6 +1145,11 @@ static void rng_systemJitter(void)
--    }
-- }
-- 
--+/*
--+ * Modified to abort the process if it failed to read from /dev/urandom.
--+ *
--+ * See crbug.com/244661 for details.
--+ */
-- size_t RNG_SystemRNG(void *dest, size_t maxLen)
-- {
--     FILE *file;
--@@ -1144,7 +1160,10 @@ size_t RNG_SystemRNG(void *dest, size_t maxLen)
-- 
--     file = fopen("/dev/urandom", "r");
--     if (file == NULL) {
---      return rng_systemFromNoise(dest, maxLen);
--+      fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
--+              "Abort process.\n", __FILE__, __LINE__);
--+      fflush(stderr);
--+      abort();
--     }
--     /* Read from the underlying file descriptor directly to bypass stdio
--      * buffering and avoid reading more bytes than we need from /dev/urandom.
--@@ -1164,8 +1183,10 @@ size_t RNG_SystemRNG(void *dest, size_t maxLen)
--     }
--     fclose(file);
--     if (fileBytes != maxLen) {
---      PORT_SetError(SEC_ERROR_NEED_RANDOM);  /* system RNG failed */
---      fileBytes = 0;
--+      fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
--+              "Abort process.\n", __FILE__, __LINE__);
--+      fflush(stderr);
--+      abort();
--     }
--     return fileBytes;
-- }