Update NSPR to 4.12 and NSS to 3.23 on iOS

nss/lib/freebl/rijndael.c

Index: nss/lib/freebl/rijndael.c
diff --git a/nss/lib/freebl/rijndael.c b/nss/lib/freebl/rijndael.c
index 4e4be79fdf10696e8b286a31cc06d52d7199d360..f6e38f62bdc792b4956c1cac7997ce445c726e88 100644
--- a/nss/lib/freebl/rijndael.c
+++ b/nss/lib/freebl/rijndael.c
@@ -7,6 +7,7 @@
 #endif
 
 #include "prinit.h"
+#include "prenv.h"
 #include "prerr.h"
 #include "secerr.h"
 
@@ -30,6 +31,9 @@ static PRBool use_hw_aes = PR_FALSE;
 static int has_intel_avx = 0;
 static int has_intel_clmul = 0;
 static PRBool use_hw_gcm = PR_FALSE;
+#if defined(_MSC_VER) && !defined(_M_IX86)
+#include <intrin.h>  /* for _xgetbv() */
+#endif
 #endif
 #endif  /* USE_HW_AES */
 
@@ -1038,7 +1042,7 @@ aes_InitContext(AESContext *cx, const unsigned char *key, unsigned int keysize,
 #ifdef USE_HW_AES
     if (has_intel_aes == 0) {
 	unsigned long eax, ebx, ecx, edx;
-	char *disable_hw_aes = getenv("NSS_DISABLE_HW_AES");
+	char *disable_hw_aes = PR_GetEnvSecure("NSS_DISABLE_HW_AES");
 
 	if (disable_hw_aes == NULL) {
 	    freebl_cpuid(1, &eax, &ebx, &ecx, &edx);