Compiling on Alpine Linux with musl libc fails due to type conversion error.

[Soldering-Stan]

Hi,

compilation fails with the following error messages. I have modified the offending code and it now comiles and works correctly (I've attached diff to bottom of this message), I'm quite happy to make a pull request etc. but don't have full permissions on github to access it. Can somebody grant me permissions etc. or apply the patches if you don't want any old oik access the source :-)

/dev/shm/atomicparsley-master/src/parsley.cpp:5730:26: error: cannot convert 'off_t*' {aka 'long int*'} to 'const fpos_t*' {aka 'const _G_fpos64_t*'}
 5730 |       fsetpos(dest_file, &file_offset);
      |                          ^~~~~~~~~~~~
      |                          |
      |                          off_t* {aka long int*}
In file included from /usr/include/fortify/stdio.h:22,
                 from /dev/shm/atomicparsley-master/src/AtomicParsley.h:50,
                 from /dev/shm/atomicparsley-master/src/AtomDefs.h:23,
                 from /dev/shm/atomicparsley-master/src/parsley.cpp:30:
/usr/include/stdio.h:85:21: note:   initializing argument 2 of 'int fsetpos(FILE*, const fpos_t*)'
   85 | int fsetpos(FILE *, const fpos_t *);
      |                     ^~~~~~~~~~~~~~
/dev/shm/atomicparsley-master/src/parsley.cpp:5745:26: error: cannot convert 'off_t*' {aka 'long int*'} to 'const fpos_t*' {aka 'const _G_fpos64_t*'}
 5745 |       fsetpos(dest_file, &file_offset);
      |                          ^~~~~~~~~~~~
      |                          |
      |                          off_t* {aka long int*}
In file included from /usr/include/fortify/stdio.h:22,
                 from /dev/shm/atomicparsley-master/src/AtomicParsley.h:50,
                 from /dev/shm/atomicparsley-master/src/AtomDefs.h:23,
                 from /dev/shm/atomicparsley-master/src/parsley.cpp:30:
/usr/include/stdio.h:85:21: note:   initializing argument 2 of 'int fsetpos(FILE*, const fpos_t*)'
   85 | int fsetpos(FILE *, const fpos_t *);
      |                     ^~~~~~~~~~~~~~
make[2]: *** [CMakeFiles/AtomicParsley.dir/build.make:187: CMakeFiles/AtomicParsley.dir/src/parsley.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:96: CMakeFiles/AtomicParsley.dir/all] Error 2
make: *** [Makefile:104: all] Error 2

Stan's diff below

diff /dev/shm/atomicparsley-master/src/parsley.cpp /usr/local/src/atomicparsley/src/parsley.cpp

5726a5727,5732
> #elif defined(fpos64_t)
>       // Using this it's the only way I can identify musl libc
>       // used on Alpine Linux
> 
>       fpos_t file_offset;
>       file_offset.__lldata = dest_position + file_pos;
5741a5748,5753
> #elif defined(fpos64_t)
>       // Using this because it's the only way I can identify musl libc
>       // used on Alpine Linux
> 
>       fpos_t file_offset;
>       file_offset.__lldata = dest_position + file_pos;

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