bugfix: make checkcfg init/cfg vars global

Instead of them being local to the translation unit.

This should ensure that firejail.config is not read more than once (as
is intended by the code), especially after options like `private-etc`
are applied (which could render the file inaccessible when calling
`checkcfg()`).

Related commits:

* 8bff773 ("add symlink resolution for home directories", 2019-07-09)
  / issue #2877
* d325099 ("rewrite/partial revert of
  8bff773", 2019-08-09)
  / issue #2877
* d1aeeb4 ("feature: add arg-max-count and arg-max-len options to
  firejail.config (#6878)", 2025-10-30)

Relates to #2877 #6966.

Author: kmk3

src/firejail/checkcfg.c

@@ -26,8 +26,8 @@
 
 #define MAX_READ 8192				  // line buffer for profile files
 
-static int firejail_config_init = 0;
-static int cfg_val[CFG_MAX];
+int firejail_config_init = 0;
+int cfg_val[CFG_MAX];
 char *xephyr_screen = "800x600";
 char *xephyr_extra_params = "";
 char *xpra_extra_params = "";

src/firejail/firejail.h

@@ -869,6 +869,8 @@ enum {
 	CFG_TRACELOG,
 	CFG_MAX // this should always be the last entry
 };
+extern int firejail_config_init;
+extern int cfg_val[CFG_MAX];
 extern char *xephyr_screen;
 extern char *xephyr_extra_params;
 extern char *xpra_extra_params;