util: Fix build on GNU Hurd

Hurd apparently #defines BSD, but doesn't profide strtofflags.  So make
all that code conditional on !__GNU__.

Link: https://buildd.debian.org/status/fetch.php?pkg=bfs&arch=hurd-i386&ver=2.2-1&stamp=1615370700&raw=0

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index 63ea756..42e3d98 100644
--- a/util.c
+++ b/util.c
@@ -237,7 +237,7 @@ int xfaccessat(int fd, const char *path, int amode) {
 }
 
 int xstrtofflags(const char **str, unsigned long long *set, unsigned long long *clear) {
-#if BSD
+#if BSD && !__GNU__
 	char *str_arg = (char *)*str;
 	unsigned long set_arg = 0;
 	unsigned long clear_arg = 0;