Don't inline crc64 for gcc-5 compatability

This patch is backported from Debian and it fixes the following error:

bcache.c:125:9: warning: 'crc_table' is static but used in inline
function 'crc64' which is not static
...
make-bcache.c:277: undefined reference to `crc64'

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

From: David Mohr <david@mcbf.net>
Date: Tue, 26 May 2015 20:34:31 -0600
Subject: Don't inline crc64 for gcc-5 compatability

Forwarded: http://article.gmane.org/gmane.linux.kernel.bcache.devel/2919

By James Cowgill, see Debian bug #777798
---
 bcache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bcache.c b/bcache.c
index 8f37445..8b4b986 100644
--- a/bcache.c
+++ b/bcache.c
@@ -115,7 +115,7 @@ static const uint64_t crc_table[256] = {
 	0x9AFCE626CE85B507ULL
 };
 
-inline uint64_t crc64(const void *_data, size_t len)
+uint64_t crc64(const void *_data, size_t len)
 {
 	uint64_t crc = 0xFFFFFFFFFFFFFFFFULL;
 	const unsigned char *data = _data;