[w3m-dev 04326] suppress compile warnings

Index: file.c
===================================================================
RCS file: /cvsroot/w3m/w3m/file.c,v
retrieving revision 1.259
diff -u -r1.259 file.c
--- file.c      19 Jul 2010 23:34:00 -0000      1.259
+++ file.c      24 Jul 2010 04:25:27 -0000
@@ -1216,7 +1216,7 @@
  */

 static Str
-digest_hex(char *p)
+digest_hex(unsigned char *p)
 {
     char *h = "0123456789abcdef";
     Str tmp = Strnew_size(MD5_DIGEST_LENGTH * 2 + 1);
@@ -1239,7 +1239,7 @@
               HRequest *hr, FormList *request)
 {
     Str tmp, a1buf, a2buf, rd, s;
-    char md5[MD5_DIGEST_LENGTH + 1];
+    unsigned char md5[MD5_DIGEST_LENGTH + 1];
     Str uri = HTTPrequestURI(pu, hr);
     char nc[] = "00000001";

@@ -1251,7 +1251,7 @@

     static union {
        int r[4];
-       char s[sizeof(int) * 4];
+       unsigned char s[sizeof(int) * 4];
     } cnonce_seed;
     int qop_i = QOP_NONE;

@@ -5264,6 +5264,7 @@
     return NULL;
 }

+static int
 ex_efct(int ex)
 {
     int effect = 0;