block-sha1: more good unaligned memory access candidates

In addition to X86, PowerPC and S390 are capable of unaligned memory
accesses.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

block-sha1/sha1.c

@@ -67,7 +67,10 @@
  * and is faster on architectures with memory alignment issues.
  */
 
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__x86_64__) || \
+    defined(__ppc__) || defined(__ppc64__) || \
+    defined(__powerpc__) || defined(__powerpc64__) || \
+    defined(__s390__) || defined(__s390x__)
 
 #define get_be32(p)	ntohl(*(unsigned int *)(p))
 #define put_be32(p, v)	do { *(unsigned int *)(p) = htonl(v); } while (0)