Add char* cast to avoid compiler warnings

In libc-client 2007f `data` is declared as `unsigned char *`; there may
be variants which declare it as `void *`, but in any case picky
compilers may warn about a pointer type mismatch in the conditional
(and error with `-W-error`), so we're adding a `char *` cast for good
measure.

Author: cmb69

ext/imap/php_imap.c

@@ -3937,7 +3937,7 @@ PHP_FUNCTION(imap_mail_compose)
 			efree(mystring);
 			mystring=tempstring;
 	} else if (bod) {
-		spprintf(&tempstring, 0, "%s%s%s", mystring, bod->contents.text.data ? bod->contents.text.data : "", CRLF);
+		spprintf(&tempstring, 0, "%s%s%s", mystring, bod->contents.text.data ? (char *) bod->contents.text.data : "", CRLF);
 		efree(mystring);
 		mystring=tempstring;
 	} else {