Win64: Fix a pointer truncation bug in nspr.

patches/nspr-no-pointers-in-longs.patch

+diff --git a/nspr/pr/src/threads/combined/pruthr.c b/nspr/pr/src/threads/combined/pruthr.c
+index 825ed89..4fb8765 100644
+--- a/nspr/pr/src/threads/combined/pruthr.c
++++ b/nspr/pr/src/threads/combined/pruthr.c
+@@ -73,13 +73,13 @@ void _PR_InitThreads(PRThreadType type, PRThreadPriority priority,
+ #ifndef HAVE_CUSTOM_USER_THREADS
+     stack = PR_NEWZAP(PRThreadStack);
+ #ifdef HAVE_STACK_GROWING_UP
+-    stack->stackTop = (char*) ((((long)&type) >> _pr_pageShift)
++    stack->stackTop = (char*) ((((intptr_t)&type) >> _pr_pageShift)
+                   << _pr_pageShift);
+ #else
+ #if defined(SOLARIS) || defined (UNIXWARE) && defined (USR_SVR4_THREADS)
+     stack->stackTop = (char*) &thread;
+ #else
+-    stack->stackTop = (char*) ((((long)&type + _pr_pageSize - 1)
++    stack->stackTop = (char*) ((((intptr_t)&type + _pr_pageSize - 1)
+                 >> _pr_pageShift) << _pr_pageShift);
+ #endif
+ #endif
+@@ -174,12 +174,12 @@ static void _PR_InitializeNativeStack(PRThreadStack *ts)
+         ** Setup stackTop and stackBottom values.
+         */
+ #ifdef HAVE_STACK_GROWING_UP
+-    ts->allocBase = (char*) ((((long)&ts) >> _pr_pageShift)
++    ts->allocBase = (char*) ((((intptr_t)&ts) >> _pr_pageShift)
+                   << _pr_pageShift);
+         ts->stackBottom = ts->allocBase + ts->stackSize;
+         ts->stackTop = ts->allocBase;
+ #else
+-        ts->allocBase = (char*) ((((long)&ts + _pr_pageSize - 1)
++        ts->allocBase = (char*) ((((intptr_t)&ts + _pr_pageSize - 1)
+                 >> _pr_pageShift) << _pr_pageShift);
+         ts->stackTop    = ts->allocBase;
+         ts->stackBottom = ts->allocBase - ts->stackSize;