Snippets for libisoburn 1.5.8 from Fedora ppc64le

Sourced from https://kojipkgs.fedoraproject.org/packages/libisoburn/1.5.8/3.fc45/data/logs/ppc64le/build.log.

• xorriso/disk_ops.c:2173:6: warning: variable 'open_mode' set but not used [-Wunused-but-set-variable=]
   2173 |  int open_mode= O_WRONLY | O_CREAT;
        |      ^~~~~~~~~
  

• xorriso/parse_exec.c:2580:11: warning: variable 'linecount' set but not used [-Wunused-but-set-variable=]
   2580 |  int ret, linecount= 0;
        |           ^~~~~~~~~
  

• xorriso/iso_img.c:290:8: warning: taking the absolute value of unsigned type 'char' has no effect [-Wabsolute-value]
    290 |    at= abs(pvd_time[16]);
        |        ^~~