Fix remaining issues on PPC64EL

One AltiVec-related build issue remained
Self tests now pass on LE POWER platforms

Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>

extern/poshlib/posh.h

@@ -672,7 +672,7 @@ LLVM:
 ** the MIPS series, so we have to be careful about those.
 ** ----------------------------------------------------------------------------
 */
-#if defined POSH_CPU_X86 || defined POSH_CPU_AXP || defined POSH_CPU_STRONGARM || defined POSH_CPU_AARCH64 || defined POSH_OS_WIN32 || defined POSH_OS_WINCE || defined __MIPSEL__
+#if defined POSH_CPU_X86 || defined POSH_CPU_AXP || defined POSH_CPU_STRONGARM || defined POSH_CPU_AARCH64 || defined POSH_OS_WIN32 || defined POSH_OS_WINCE || defined __MIPSEL__ || defined __ORDER_LITTLE_ENDIAN__
 #  define POSH_ENDIAN_STRING "little"
 #  define POSH_LITTLE_ENDIAN 1
 #else

src/nvtt/squish/maths.h

@@ -26,10 +26,18 @@
 #ifndef NV_SQUISH_MATHS_H
 #define NV_SQUISH_MATHS_H
 
+#if NV_USE_ALTIVEC
+#undef vector
+#endif
+
 #include <cmath>
 #include <algorithm>
 #include "config.h"
 
+#if NV_USE_ALTIVEC
+#define vector __vector
+#endif
+
 namespace nvsquish {
 
 class Vec3