cpu: remove SIGILL testing on PPC

Linux, FreeBSD and OpenBSD have proper checks and do not use this code.
macOS also had tests while it was supported, but it no longer is.

src/misc/cpu.c

@@ -58,8 +58,7 @@
 #include <machine/cpu.h>
 #endif
 
-#if defined (__i386__) || defined (__x86_64__) || defined (__powerpc__) \
- || defined (__ppc__) || defined (__ppc64__) || defined (__powerpc64__)
+#if defined (__i386__) || defined (__x86_64__)
 # if defined (HAVE_FORK)
 static bool vlc_CPU_check (const char *name, void (*func) (void))
 {
@@ -94,14 +93,6 @@ VLC_SSE static void SSE_test (void)
     asm volatile ("xorps %%xmm0,%%xmm0\n" : : : "xmm0", "xmm1");
 }
 #endif
-
-#if defined (CAN_COMPILE_ALTIVEC)
-static void Altivec_test (void)
-{
-    asm volatile ("mtspr 256, %0\n" "vand %%v0, %%v0, %%v0\n" : : "r" (-1));
-}
-#endif
-
 #else /* _WIN32 || __OS2__ */
 # define vlc_CPU_check(name, func) (1)
 #endif
@@ -192,11 +183,6 @@ out:
 
     if( i_error == 0 && i_has_altivec != 0 )
         i_capabilities |= VLC_CPU_ALTIVEC;
-
-#   elif defined( CAN_COMPILE_ALTIVEC )
-    if (vlc_CPU_check ("Altivec", Altivec_test))
-        i_capabilities |= VLC_CPU_ALTIVEC;
-
 #   endif
 
 #endif