Unbreak the MinGW build broken by recent changes in callproc.c

* src/w32.h (set_process_dir):
* src/w32proc.c (set_process_dir): Change the argument to 'const
char *'.
* src/lisp.h (make_environment_block):
* src/callproc.c (make_environment_block): Now returns 'char **'.
(exec_failed) [DOS_NT]: Remove unused function.
* src/callproc.c (child_setup): NEW_ARGV and ENV are now 'char **'.
Making them 'const' breaks the MinGW build and is not needed for
other platforms.
* src/callproc.c (emacs_spawn): ARGV and ENVP arguments are now
'char *', for the same reason.
* src/process.c (create_process): Adapt to above changes.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index f3de9251b7a..98b575fc864 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2127,7 +2127,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
 
   /* This may signal an error.  */
   setup_process_coding_systems (process);
-  char *const *env = make_environment_block (current_dir);
+  char **env = make_environment_block (current_dir);
 
   pty_flag = p->pty_flag;
   eassert (pty_flag == ! NILP (lisp_pty_name));