Drop guard for CPU detection, configure won't get this wrong, and this
check fails on some PPC platforms where these guards aren't set (due to
different kernel/libc).

--- a/src/hwf-ppc.c
+++ b/src/hwf-ppc.c
@@ -33,9 +33,6 @@
 #include "g10lib.h"
 #include "hwf-common.h"
 
-#if !defined (__powerpc__) && !defined (__powerpc64__)
-# error Module build for wrong CPU.
-#endif
 
 
 #if defined(HAVE_SYS_AUXV_H) && defined(HAVE_ELF_AUX_INFO) && \