build - find environe and build when found

meson didnt look for environ thus it was never found and defined. this
is a fallback for having no clearenv() so essentially no os work
talking about is in this situation anymore.

meson.build

@@ -198,6 +198,17 @@ endif
 
 dep_fnmatch = cc.find_library('fnmatch', required: false)
 
+code = '''#define _GNU_SOURCE 1
+#include <unistd.h>
+#include <stdio.h>
+extern char **environ;
+void func(void) { printf("%p\n", environ); }
+'''
+if cc.compiles(code, args : '-lc', name : 'environ check')
+  config_h.set10('HAVE_ENVIRON', true)
+endif
+
+
 add_global_arguments('-DPACKAGE_BIN_DIR="@0@"'.format(dir_bin), language: 'c')
 add_global_arguments('-DPACKAGE_LIB_DIR="@0@"'.format(dir_lib), language: 'c')
 add_global_arguments('-DPACKAGE_DATA_DIR="@0@"'.format(join_paths(dir_data, proj)), language: 'c')

src/bin/e_util_suid.h

@@ -198,7 +198,7 @@ e_setuid_setup(uid_t *caller_uid, gid_t *caller_gid, char **caller_user, char **
 # ifdef HAVE_ENVIRON
    if (environ)
      {
-        int again;
+        int i, again;
         // go over environment array again and again... safely
         do
           {