misc: ISSPACE() => ISBLANK()

Instances of ISSPACE() use that should rather use ISBLANK(). I think
somewhat carelessly used because it sounds as if it checks for space or
whitespace, but also includes %0a to %0d.

For parsing purposes, we should only accept what we must and not be
overly liberal. It leads to surprises and surprises lead to bad things.

Closes #9432

src/tool_cb_hdr.c

@@ -116,7 +116,7 @@ size_t tool_header_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
       const char *etag_h = &str[5];
       const char *eot = end - 1;
       if(*eot == '\n') {
-        while(ISSPACE(*etag_h) && (etag_h < eot))
+        while(ISBLANK(*etag_h) && (etag_h < eot))
           etag_h++;
         while(ISSPACE(*eot))
           eot--;

src/tool_msgs.c

@@ -59,7 +59,7 @@ static void voutf(struct GlobalConfig *config,
       if(len > width) {
         size_t cut = width-1;
 
-        while(!ISSPACE(ptr[cut]) && cut) {
+        while(!ISBLANK(ptr[cut]) && cut) {
           cut--;
         }
         if(0 == cut)