stress-ng: disable vecmath on ppc64/glibc/BE for now

[ci skip]

srcpkgs/stress-ng/patches/ppc64-glibc-be-no-vecmath.patch

@@ -0,0 +1,16 @@
+On big endian ppc64 glibc specifically, this causes ICEs.
+
+--- stress-vecmath.c
++++ stress-vecmath.c
+@@ -53,6 +53,11 @@ static const help_t help[] = {
+ #undef HAVE_VECMATH
+ #endif
+ 
++/* currently ICEs on our toolchain... */
++#if defined(STRESS_PPC64) && defined(__GLIBC__) && defined(__BIG_ENDIAN__)
++#undef HAVE_VECMATH
++#endif
++
+ #if defined(HAVE_VECMATH)
+ 
+ typedef int8_t  vint8_t  __attribute__ ((vector_size (16)));