Inlcude the assembly language implementation of the stack operations only when

_PR_HAVE_ATOMIC_CAS is defined. Bugzilla #11576.

nsprpub/config/SunOS5.mk

@@ -54,6 +54,7 @@ endif
 ifdef NS_USE_GCC
 CC			= gcc -Wall
 CCC			= g++ -Wall
+ASFLAGS			+= -Wa,-P
 COMPILER_TAG		= _gcc
 ifdef NO_MDUPDATE
 OS_CFLAGS		= $(NOMD_OS_CFLAGS)

nsprpub/pr/src/md/unix/os_SunOS_x86.s

@@ -59,6 +59,7 @@ sol_curthread:
 	movl	%ecx, %eax
 	ret
 
+#ifdef _PR_HAVE_ATOMIC_CAS
 /
 / PR_StackPush(listp, elementp)
 /
@@ -137,3 +138,4 @@ empty:
 / Return previous listp value (already in eax)
 	ret
 
+#endif / _PR_HAVE_ATOMIC_CAS