Some cleanups and minor fixes

[zoziha]

Description

While using fpm and reading the fpm source code, I have found some small areas for improvement, as they tend to be small and have little impact on the overall functionality of fpm, and it doesn't seem worth it to list them as a single PR.

Updates

The work this PR does:

1. Delete the unused fnv_1a reference;
2. Update number_of_rows, remove unnecessary character reading;
3. Update mkdir and os_delete_dir, the output format of which is somewhat complicated, and the current modification is unified with the following style:
   

   fpm/src/fpm_filesystem.F90

   Line 906 in aec789f

   if(echo_local) print *, '+ ', cmd

4. Logical operators using ==, /=, etc. are more intuitive and modern than .eq., .ne.;
5. The display of compilation percentage output style has been corrected;

[  24%]Compiling ...  # Original
[ 24%] Compiling ...  # Now

6. In the new_test test, the wildcard command line used in CMD shell on Windows did not actually take effect, which was corrected;

📢 PS. I made a single commit record for each fix, it would be simple enough to review them in turn.

[LKedward]

Thanks @zoziha - these changes all look fine to me. A couple of minor comments:

• Are you able to fix this line in new-test as well:

  fpm/test/new_test/new_test.f90

  Line 156 in cd8b5cc

  rm_command = 'rmdir ' // dirs_to_be_removed // ' /s /q'

• In backend_output, perhaps we should just declare overall_progress with length 7 and remove the (:7) indexing?

[zoziha]

Thanks for reviewing, @LKedward .

• Are you able to fix this line in new-test as well:

  fpm/test/new_test/new_test.f90

  Line 156 in cd8b5cc

  rm_command = 'rmdir ' // dirs_to_be_removed // ' /s /q'

Sorry I didn't see this line of code before, I'll update my commit to fix it.

• In backend_output, perhaps we should just declare overall_progress with length 7 and remove the (:7) indexing?

Nice suggestion ~

[LKedward]

Great stuff! Thanks @zoziha

[awvwgk]

Thanks for sharing. Looks good to me.

[zoziha]

Thanks you for the review, @LKedward , @awvwgk .

Since it got two approvals, I'll merge this PR.