fixes: improve login environment handling (#114)

* chore(organization): allow nested header and c files

* feat: add shell login "middleware" & etc:
  * lidm now calls `bash` (or other shells, depends on PACKAGE cfg) in
  login mode as a session wrapper to source most env (can be disabled)
  * this fixes a lot of env problems with all `/etc/profile` and more

Extra:
* implemented a musl compatible version of `execvpe` and now lidm should
  search for PATH everywhere it needs to
* `search_path` now also checks if the found binary is properly
  executable
* lidm now uses `confstr` for a decent PATH default if none is found
* logs are unbuffered for cases where debug logs appear empty (exit
  without handlers moment)

* chore: one-time evaluate certain makefile vars

---------

Co-authored-by: grialion <48643945+grialion@users.noreply.github.com>

include/util/path.h

@@ -0,0 +1,10 @@
+#ifndef UTIL_PATH_H
+#define UTIL_PATH_H
+
+#include "macros.h"
+
+char* NULLABLE search_path(const char* NNULLABLE for_binary);
+int execvpe(const char* NNULLABLE file, char* NULLABLE const argv[NNULLABLE],
+            char* NULLABLE const envp[NNULLABLE]);
+
+#endif /* UTIL_PATH_H */