Snippets for mupdf 1.28.3 from Alpine s390x

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-s390x/community/mupdf/mupdf-1.28.3-r1.log.

• source/fitz/path.c:1187:19: warning: 'n' may be used uninitialized [-Wmaybe-uninitialized]
   1187 |         int i, k, n;
        |                   ^
  

• source/html/html-layout.c:4782:20: warning: 'heading' may be used uninitialized [-Wmaybe-uninitialized]
   4782 |                 if (heading || box->id != NULL || box->href)
        |                    ^
  

• platform/x11/curl_stream.c:289:17: warning: call to 'Wcurl_easy_setopt_err_long' declared with attribute warning: curl_easy_setopt expects a long argument [-Wattribute-warning]
    289 |                 curl_easy_setopt(state->easy, CURLOPT_NOBODY, 0);
        |                 ^~~~~~~~~~~~~~~~