env-util: make env-util.h self contained

The header file references strlen(), hence it should include string.h

diff --git a/src/basic/env-util.h b/src/basic/env-util.h
index ef9398e618942c200faf460b010a62bf9e7a092a..174433ea91e6e13f2b5d305c9cd94c9f51ea7c6c 100644 (file)
--- a/src/basic/env-util.h
+++ b/src/basic/env-util.h
@@ -6,6 +6,7 @@
 #include <stdio.h>
 
 #include "macro.h"
+#include "string.h"
 
 bool env_name_is_valid(const char *e);
 bool env_value_is_valid(const char *e);