[PATCH] build-sys: fix crypt() detection without -lcrypt

[Johannes Nixdorf <mixi@xxxxxxxxxxxxx>]

The check tested whether code using crypt() links without -lcrypt, but
didn't set have_crypt to yes if it succeeded.

This fixes the check erroneously failing when compiling against musl
libc.

Signed-off-by: Johannes Nixdorf <mixi@xxxxxxxxxxxxx>
---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 4c8de521f..0bf422cda 100644
--- a/configure.ac
+++ b/configure.ac
@@ -798,7 +798,10 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 #endif
 ]], [[
 char *c = crypt("abc","pw");
-]])],[],[
+]])],[
+  have_libcrypt=no
+  have_crypt=yes
+],[
   LIBS="$LIBS -lcrypt"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
   #ifdef HAVE_CRYPT_H
-- 
2.20.1