There's a merged pull request on the void-packages repository

git: correct ac_cv_fread_reads_directories on all platforms 
https://github.com/void-linux/void-packages/pull/18139

Description:
From commit bf8bba6, (git: correct ac_cv_fread_reads_directories on
musl, 2018-11-14), we've correctly set ac_cv_fread_reads_directories for
git linked with musl-libc variant.

Unfortunately, glibc also allows fopen on directory. But, I was obsessed
with musl-libc at the time, hence forgot to run the test for glibc.

Correct it.

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Discovered this problem when I run check on v2.25.0.rc2 in preparation for the next release.