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/ui.h

@@ -3,7 +3,7 @@
 
 #include "config.h"
 #include "ofield.h"
-#include "util.h"
+#include "util/vec.h"
 
 //    [box_start]
 //    ↓
@@ -40,7 +40,7 @@
 #define VALUE_MAXLEN (BOX_WIDTH - VALUES_COL + 1 - BOX_HMARGIN - 2)
 
 enum Input { SESSION, USER, PASSWD };
-extern const u_char INPUTS_N;
+extern const uint8_t INPUTS_N;
 
 void setup(struct config* config);
 int load(struct Vector* users, struct Vector* sessions);