Avoid compiler warnings (gcc's -Wcast-qual).

diff -ur t1utils-1.37.orig/clp.c t1utils-1.37/clp.c
--- t1utils-1.37.orig/clp.c	2011-04-04 16:47:48.000000000 +0200
+++ t1utils-1.37/clp.c	2011-07-20 18:22:17.000000000 +0200
@@ -1074,21 +1074,27 @@
 parse_int(Clp_Parser *clp, const char *arg, int complain, void *user_data)
 {
     const char *val;
+    char *temp;
     if (*arg == 0 || isspace((unsigned char) *arg)
 	|| (user_data != 0 && *arg == '-'))
 	val = arg;
     else if (user_data != 0) {	/* unsigned */
 #if HAVE_STRTOUL
-	clp->val.u = strtoul(arg, (char **) &val, 0);
+	clp->val.u = strtoul(arg, &temp, 0);
+	val = temp;
 #else
 	/* don't bother really trying to do it right */
 	if (arg[0] == '-')
 	    val = arg;
-	else
-	    clp->val.u = strtol(arg, (char **) &val, 0);
+	else {
+	    clp->val.u = strtol(arg, &temp, 0);
+	    val = temp;
+	}
 #endif
-    } else
-	clp->val.i = strtol(arg, (char **) &val, 0);
+    } else {
+	clp->val.i = strtol(arg, &temp, 0);
+	val = temp;
+    }
     if (*arg != 0 && *val == 0)
 	return 1;
     else if (complain) {
@@ -1104,11 +1110,14 @@
 parse_double(Clp_Parser *clp, const char *arg, int complain, void *user_data)
 {
     const char *val;
+    char *temp;
     (void)user_data;
     if (*arg == 0 || isspace((unsigned char) *arg))
 	val = arg;
-    else
-	clp->val.d = strtod(arg, (char **) &val);
+    else {
+	clp->val.d = strtod(arg, &temp);
+	val = temp;
+    }
     if (*arg != 0 && *val == 0)
 	return 1;
     else if (complain)
diff -ur t1utils-1.37.orig/t1disasm.c t1utils-1.37/t1disasm.c
--- t1utils-1.37.orig/t1disasm.c	2011-04-04 16:47:49.000000000 +0200
+++ t1utils-1.37/t1disasm.c	2011-07-20 18:22:17.000000000 +0200
@@ -332,11 +332,11 @@
 /* 23.Feb.2004 - use 'memstr', not strstr, because the strings input to
    eexec_line aren't null terminated! Reported by Werner Lemberg. */
 
-static const unsigned char *
-oog_memstr(const unsigned char *line, int line_len, const char *pattern, int pattern_len)
+static unsigned char *
+oog_memstr(unsigned char *line, int line_len, const char *pattern, int pattern_len)
 {
-    const unsigned char *try;
-    const unsigned char *last = line + line_len - pattern_len + 1;
+    unsigned char *try;
+    unsigned char *last = line + line_len - pattern_len + 1;
     while (line < last
 	   && (try = memchr(line, (unsigned char)*pattern, last - line))) {
 	if (memcmp(try, pattern, pattern_len) == 0)
@@ -432,7 +432,7 @@
        badly: a charstring definition follows "/Charstrings ... begin", ON THE
        SAME LINE. */
     {
-	const char *CharStrings = (const char *)
+	char *CharStrings = (char *)
 	    oog_memstr(line, line_len, "/CharStrings ", 13);
 	int crap, n;
 	char should_be_slash = 0;