bitops: fix error on OpenBSD and mingw32

Fix this error:
  CC    bitops.o
In file included from /src/qemu/bitops.c:14:
/src/qemu/bitops.h:69: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'unsigned'

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

bitops.h

@@ -66,7 +66,7 @@ static unsigned long bitops_ffsl(unsigned long word)
  *
  * Undefined if no set bit exists, so code should check against 0 first.
  */
-static __always_inline unsigned long bitops_flsl(unsigned long word)
+static inline unsigned long bitops_flsl(unsigned long word)
 {
 	int num = BITS_PER_LONG - 1;