Compiler food.

Missing header from previous commit.

service.h

@@ -140,8 +140,8 @@ int set_service_description(const TCHAR *, SC_HANDLE, TCHAR *);
 int get_service_description(const TCHAR *, SC_HANDLE, unsigned long, TCHAR *);
 int get_service_startup(const TCHAR *, SC_HANDLE, const QUERY_SERVICE_CONFIG *, unsigned long *);
 int get_service_username(const TCHAR *, const QUERY_SERVICE_CONFIG *, TCHAR **, size_t *);
-int set_service_environment(nssm_service_t *);
-int unset_service_environment(nssm_service_t *);
+void set_service_environment(nssm_service_t *);
+void unset_service_environment(nssm_service_t *);
 int pre_install_service(int, TCHAR **);
 int pre_remove_service(int, TCHAR **);
 int pre_edit_service(int, TCHAR **);