Fix file regeneration logic

Fixes #441

src/build.rs

@@ -1189,7 +1189,7 @@ pub fn cbuild(
     for cpkg in members.iter_mut() {
         // it is a new build, build the additional files and update update the cache
         // if the hash value does not match.
-        if new_build && !cpkg.finger_print.is_valid() {
+        if new_build || !cpkg.finger_print.is_valid() {
             let name = &cpkg.capi_config.library.name;
             let (pkg_config_static_libs, static_libs) = if library_types.only_cdylib() {
                 (String::new(), String::new())