nss: fix build on altivec-but-no-vsx setups

srcpkgs/nss/patches/ppc64-no-vsx.patch

@@ -0,0 +1,14 @@
+The header contains vectors of long long, which are only available with the
+VSX instruction set. We don't compile with VSX on big endian systems.
+
+--- nss/lib/freebl/gcm.h
++++ nss/lib/freebl/gcm.h
+@@ -30,7 +30,7 @@
+ #include <arm_neon.h>
+ #endif
+ 
+-#ifdef __powerpc64__
++#if defined(__powerpc64__) && defined(__VSX__)
+ #include "altivec-types.h"
+ 
+ /* The ghash freebl test tries to use this in C++, and gcc defines conflict. */