Fix const-correctness issues uncovered by gcc -Wwrite-strings

* defs.h (struct xlat): Add const qualifier to the field of
type "char *".
(set_sortby, qualify, printnum, printnum_int): Add const qualifier to
arguments of type "char *".
* count.c (set_sortby): Add const qualifier to the argument and
automatic variable of type "char *".
* desc.c (decode_select): Add const qualifier to automatic variables of
type "char *".
* ioctlsort.c (struct ioctlent): Add const qualifier to fields of
type "char *".
(main):  Add const qualifier to argv.
* process.c (printargv): Add const qualifier to the argument and
automatic variable of type "char *".
(printargc) Add const qualifier to argument of type "char *".
* signal.c (sprintsigmask, parse_sigset_t): Add const qualifier to
arguments of type "char *".
* strace.c (progname): Add const qualifier.
(detach): Add const qualifier to automatic variable of type "char *".
* stream.c (struct strbuf): Add const qualifier to the field of
type "char *".
* syscall.c (struct qual_options): Add const qualifier to fields of
type "char *".
(qual_syscall, qual_fault, qual_desc, lookup_class): Add const qualifier
to arguments of type "char *".
(qual_signal): Add const qualifier to the argument of type "char *",
avoid modification of constant argument.
(qualify): Likewise.
* util.c (printflags): Add const qualifier to automatic variable of
type "char *".
(printnum, printnum_int): Add const qualifier to arguments of
type "char *".
diff --git a/ioctlsort.c b/ioctlsort.c
index 1009d75..7881a91 100644
--- a/ioctlsort.c
+++ b/ioctlsort.c
@@ -36,8 +36,8 @@
 #endif
 
 struct ioctlent {
-	char *doth;
-	char *symbol;
+	const char *doth;
+	const char *symbol;
 	unsigned long code;
 };
 
@@ -56,9 +56,7 @@
 }
 
 int
-main(argc, argv)
-int argc;
-char *argv[];
+main(int argc, const char *argv[])
 {
 	int i;