build-sys: added config.h include to nls.h (for PACKAGE str)

include/nls.h

@@ -1,6 +1,10 @@
 #ifndef PROCPS_NG_NLS_H
 #define PROCPS_NG_NLS_H
 
+/* programs issuing textdomain() need PACKAGE string */
+#include "../config.h"
+
+/* programs issuing bindtextdomain() also need LOCALEDIR string */
 #ifndef LOCALEDIR
 #define LOCALEDIR "/usr/share/locale"
 #endif