shared/libcrypt-util: include fewer headers

Now that we wrap crypt_r/ra uses, we can include the header only in libcrypt-util.c.

src/shared/libcrypt-util.c

@@ -1,5 +1,20 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
+#if HAVE_CRYPT_H
+/* libxcrypt is a replacement for glibc's libcrypt, and libcrypt might be
+ * removed from glibc at some point. As part of the removal, defines for
+ * crypt(3) are dropped from unistd.h, and we must include crypt.h instead.
+ *
+ * Newer versions of glibc (v2.0+) already ship crypt.h with a definition
+ * of crypt(3) as well, so we simply include it if it is present.  MariaDB,
+ * MySQL, PostgreSQL, Perl and some other wide-spread packages do it the
+ * same way since ages without any problems.
+ */
+#  include <crypt.h>
+#else
+#  include <unistd.h>
+#endif
+
 #include <errno.h>
 #include <stdlib.h>
 

src/shared/libcrypt-util.h

@@ -1,21 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-#if HAVE_CRYPT_H
-/* libxcrypt is a replacement for glibc's libcrypt, and libcrypt might be
- * removed from glibc at some point. As part of the removal, defines for
- * crypt(3) are dropped from unistd.h, and we must include crypt.h instead.
- *
- * Newer versions of glibc (v2.0+) already ship crypt.h with a definition
- * of crypt(3) as well, so we simply include it if it is present.  MariaDB,
- * MySQL, PostgreSQL, Perl and some other wide-spread packages do it the
- * same way since ages without any problems.
- */
-#include <crypt.h>
-#endif
-
 #include <stdbool.h>
-#include <stdlib.h>
 
 int make_salt(char **ret);
 int hash_password_full(const char *password, void **cd_data, int *cd_size, char **ret);

src/test/test-libcrypt-util.c

@@ -1,5 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
+#if HAVE_CRYPT_H
+#  include <crypt.h>
+#else
+#  include <unistd.h>
+#endif
+
 #include "strv.h"
 #include "tests.h"
 #include "libcrypt-util.h"