This patch for zziplib (0.13.49) fixes a bus error on Linux/SPARC.

Since SPARC machines are big endian and zip files are stored in little endian,
zziplib needs to do byte swapping. On GNU/Linux this is usually done using
glibc's bswap_{16,32,64} functions but in this case calling one of these
functions triggers a bus error. This patch makes zziplib use it's own byte
swapping functions (which do work) on Linux/SPARC instead of glibc's.

To reproduce it run (in the src dir):
	cd Linux_*_sparc64.d && ./bins/zzcat test/test/README
or
	make check

Problem found by: Ferris McCormick <fmccor@gentoo.org>
Patch written by: Friedrich Oslage <bluebird@gentoo.org>
	with advice from: Mike Frysinger <vapier@gentoo.org>

External references: https://bugs.gentoo.org/show_bug.cgi?id=239472

--- zzip/fetch.c
+++ zzip/fetch.c
@@ -17,7 +17,7 @@
 #include <zzip/fetch.h>
 
 #if defined ZZIP_WORDS_BIGENDIAN && \
-   defined bswap_16 && defined bswap_32 && defined bswap_64
+   defined bswap_16 && defined bswap_32 && defined bswap_64 && !defined(__sparc__)
 # define __ZZIP_GET16(__p)                        bswap_16(*(uint16_t*)(__p))
 # define __ZZIP_GET32(__p)                        bswap_32(*(uint32_t*)(__p))
 # define __ZZIP_SET16(__p,__x) (*(uint16_t*)(__p) = bswap_16((uint16_t)(__x)))
--- zzip/fetch.h
+++ zzip/fetch.h
@@ -24,7 +24,7 @@ extern uint64_t __zzip_get64(zzip_byte_t * s) __zzip_attribute__((const));
 extern void     __zzip_set64(zzip_byte_t * s, uint64_t v);
 
 #ifdef ZZIP_WORDS_BIGENDIAN
-# if defined bswap_16 && defined bswap_32 && defined bswap_64 /* i.e. linux */
+# if defined bswap_16 && defined bswap_32 && defined bswap_64 && !defined(__sparc__) /* i.e. linux */
 # define ZZIP_GET16(__p)                        bswap_16(*(uint16_t*)(__p))
 # define ZZIP_GET32(__p)                        bswap_32(*(uint32_t*)(__p))
 # define ZZIP_GET64(__p)                        bswap_64(*(uint64_t*)(__p))