Change files var in main to char **

There's a concern that the cast on &argv[optind] to const char **:
...
main (int argc, char *argv[])
{
  ...
  const char **files;
  ...
  files = (const char **)&argv[optind];
...
violates the aliasing rules.

Fix this by changing the type of files to char **.

2021-03-18  Tom de Vries  <tdevries@suse.de>

	* dwz.c (dwz): Make files param a char **.
	(dwz_files): Make files param char *[].
	(main): Make files var a char **.

---
 dwz.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/dwz.c b/dwz.c
index 7b67960..a7aa23b 100644
--- a/dwz.c
+++ b/dwz.c
@@ -15267,7 +15267,7 @@ struct file_result
    over FILE.  */
 static int
 dwz (const char *file, const char *outfile, struct file_result *res,
-     struct file_result *resa, const char **files)
+     struct file_result *resa, char **files)
 {
   DSO *dso;
   int ret = 0, fd;
@@ -16285,7 +16285,7 @@ dwz_one_file (const char *file, const char *outfile)
 /* Dwarf-compress FILES.  If HARDLINK, detect if some files are hardlinks and
    if so, dwarf-compress just one, and relink the others.  */
 static int
-dwz_files (int nr_files, const char *files[], bool hardlink)
+dwz_files (int nr_files, char *files[], bool hardlink)
 {
   int ret = 0;
   int i;
@@ -16413,7 +16413,7 @@ main (int argc, char *argv[])
   const char *outfile;
   bool hardlink;
   int nr_files;
-  const char **files;
+  char **files;
 
   if (elf_version (EV_CURRENT) == EV_NONE)
     error (1, 0, "library out of date");
@@ -16422,7 +16422,7 @@ main (int argc, char *argv[])
   hardlink = false;
   parse_args (argc, argv, &hardlink, &outfile);
   nr_files = argc - optind;
-  files = (const char **)&argv[optind];
+  files = &argv[optind];
 
   if (nr_files <= 1)
     {