byteswap.h: fix gcc ver test for __builtin_bswap{32,64}

The __builtin_bswap* functions were introduced in gcc-4.3, not gcc-4.2.
Fix the __GNUC_PREREQ tests to reflect this.

Otherwise trying to compile code with gcc-4.2 falls down:
In file included from /usr/include/endian.h:60,
                 from /usr/include/ctype.h:40,
/usr/include/bits/byteswap.h: In function 'unsigned int __bswap_32(unsigned int)':
/usr/include/bits/byteswap.h:46: error: '__builtin_bswap32' was not declared in this scope
/usr/include/bits/byteswap.h: In function 'long long unsigned int __bswap_64(long long unsigned int)':
/usr/include/bits/byteswap.h:110: error: '__builtin_bswap64' was not declared in this scope

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 624078b12c..b07f1db0a0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-12-03  Mike Frysinger  <vapier@gentoo.org>
+
+	* bits/byteswap.h [__GNUC__]: Change __GNUC_PREREQ from 4.2 to 4.3.
+	* sysdeps/x86/bits/byteswap.h [__GNUC__]: Likewise.
+
 2012-12-03  Jeff Law  <law@redhat.com>
 
 	* time/sys/time.h (settimeofday): Do not mark TV argument