fix header env vars and disable them by default

Author: skoro

.env.example

@@ -23,8 +23,8 @@ THEME=auto
 # These are FFI headers not original ones from the Tcl/Tk source distribution.
 # Normally headers are in `src/headers` directory but you can
 # override to yours.
-TCL_C_HEADER=tcl86.h
-TK_C_HEADER=tk86.h
+# TCL_HEADER=tcl86.h
+# TK_HEADER=tk86.h
 
 # Windows Tcl/Tk shared libs (dll).
 #

tests/TclInterp.php

@@ -24,7 +24,7 @@ protected function setUp(): void
         $env = DotEnv::create($rootDir);
 
         $os = OS::family();
-        $hFile = $env->getValue('TCL_C_HEADER', $defaultTclH);
+        $hFile = $env->getValue('TCL_HEADER', $defaultTclH);
         $shared = $env->getValue($os . '_LIB_TCL');
         if (empty($shared)) {
             switch ($os) {