Temporarily disable FFTS AltiVec support pending update to use new data types

lib/ffts/src/macros.h

@@ -42,8 +42,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "macros-neon.h"
 #elif HAVE_SSE
 #include "macros-sse.h"
-#elif __powerpc__
-#include "macros-altivec.h"
+// NOTE: AltiVec support disabled until updated to provide new V4SF variable type
+//#elif __powerpc__
+//#include "macros-altivec.h"
 #else
 #include "macros-alpha.h"
 #endif
@@ -201,4 +202,4 @@ V4SF_L_4_2(int inv,
 #define V4SF_S_4(r0, r1, r2, r3, o0, o1, o2, o3) \
     V4SF_ST(o0, r0); V4SF_ST(o1, r1); V4SF_ST(o2, r2); V4SF_ST(o3, r3);
 
-#endif /* FFTS_MACROS_H */
+#endif /* FFTS_MACROS_H */