This applies a better workaround for C++ type conflicts
in AltiVec/C++, allowing it to build on BE ppc(64).

--- a/extern/clew/include/clew.h
+++ b/extern/clew/include/clew.h
@@ -370,15 +370,18 @@ typedef unsigned int cl_GLenum;
 
 /* Define basic vector types */
 /* Workaround for ppc64el platform: conflicts with bool from C++. */
-#if defined( __VEC__ ) && !(defined(__PPC64__) && defined(__LITTLE_ENDIAN__))
+#if defined(__VEC__)
    #include <altivec.h>   /* may be omitted depending on compiler. AltiVec spec provides no way to detect whether the header is required. */
-   typedef vector unsigned char     __cl_uchar16;
-   typedef vector signed char       __cl_char16;
-   typedef vector unsigned short    __cl_ushort8;
-   typedef vector signed short      __cl_short8;
-   typedef vector unsigned int      __cl_uint4;
-   typedef vector signed int        __cl_int4;
-   typedef vector float             __cl_float4;
+   #undef vector
+   #undef bool
+   #undef pixel
+   typedef __vector unsigned char     __cl_uchar16;
+   typedef __vector signed char       __cl_char16;
+   typedef __vector unsigned short    __cl_ushort8;
+   typedef __vector signed short      __cl_short8;
+   typedef __vector unsigned int      __cl_uint4;
+   typedef __vector signed int        __cl_int4;
+   typedef __vector float             __cl_float4;
    #define  __CL_UCHAR16__  1
    #define  __CL_CHAR16__   1
    #define  __CL_USHORT8__  1