block: move fcntl_setfl()

It is only used by block/file-posix.c, move it there.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

util/oslib-posix.c

@@ -897,21 +897,6 @@ size_t qemu_get_host_physmem(void)
     return 0;
 }
 
-/* Sets a specific flag */
-int fcntl_setfl(int fd, int flag)
-{
-    int flags;
-
-    flags = fcntl(fd, F_GETFL);
-    if (flags == -1) {
-        return -errno;
-    }
-    if (fcntl(fd, F_SETFL, flags | flag) == -1) {
-        return -errno;
-    }
-    return 0;
-}
-
 int qemu_msync(void *addr, size_t length, int fd)
 {
     size_t align_mask = ~(qemu_real_host_page_size() - 1);