cmd: rename *.C to *.c

These were *.C back in 2003, before the 9 script, to avoid conflicts
with the system utilities. A later change renamed them, but that
change seems to have been lost during the hg->git conversion
because I ran the conversion on a case-insensitive file system.

Change-Id: Id32c99cb9571ef0e185c3cc9e8c8d6d5b48ca195

src/cmd/mkdir.C

@@ -1,80 +0,0 @@
-#include <u.h>
-#include <libc.h>
-
-char *e;
-ulong mode = 0777L;
-
-void
-usage(void)
-{
-	fprint(2, "usage: mkdir [-p] [-m mode] dir...\n");
-	exits("usage");
-}
-
-int
-makedir(char *s)
-{
-	int f;
-
-	if(access(s, AEXIST) == 0){
-		fprint(2, "mkdir: %s already exists\n", s);
-		e = "error";
-		return -1;
-	}
-	f = create(s, OREAD, DMDIR | mode);
-	if(f < 0){
-		fprint(2, "mkdir: can't create %s: %r\n", s);
-		e = "error";
-		return -1;
-	}
-	close(f);
-	return 0;
-}
-
-void
-mkdirp(char *s)
-{
-	char *p;
-
-	for(p=strchr(s+1, '/'); p; p=strchr(p+1, '/')){
-		*p = 0;
-		if(access(s, AEXIST) != 0 && makedir(s) < 0)
-			return;
-		*p = '/';
-	}
-	if(access(s, AEXIST) != 0)
-		makedir(s);
-}
-
-
-void
-main(int argc, char *argv[])
-{
-	int i, pflag;
-	char *m;
-
-	pflag = 0;
-	ARGBEGIN{
-	default:
-		usage();
-	case 'm':
-		m = ARGF();
-		if(m == nil)
-			usage();
-		mode = strtoul(m, &m, 8);
-		if(mode > 0777)
-			usage();
-		break;
-	case 'p':
-		pflag = 1;
-		break;
-	}ARGEND
-
-	for(i=0; i<argc; i++){
-		if(pflag)
-			mkdirp(argv[i]);
-		else
-			makedir(argv[i]);
-	}
-	exits(e);
-}