Never pass a `char' to a ctype function. I had relied on gcc -Wall

letting me know about instances of this, but it turns out that my
ctype.h explicitly casts input values to `int' to evade the
`subscript has type char' warning, so it had been carefully not
letting me know! Found them all by compiling with a doctored
ctype.h, and hopefully fixed them all too.

[originally from svn r2927]

unix/uxstore.c

@@ -80,7 +80,7 @@ void provide_xrm_string(char *string)
     memcpy(key, p, q-p);
     key[q-p-1] = '\0';
     xrms->key = key;
-    while (*q && isspace(*q))
+    while (*q && isspace((unsigned char)*q))
 	q++;
     xrms->value = dupstr(q);