[ISSUE] Tracking: rebuild armv7l-musl w/ musl-1.20.1

[pullmoll <pullmoll@users.noreply.github.com>]

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New issue by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/issues/26811

Description:
Based on @ericonr 's branch [musl-1.20.0](https://github.com/ericonr/void-packages/tree/musl-1.2.0), which now really is for musl-1.20.1, I found a patch to get `cross-armv7l-linux-musleabihf` built:
`srcpkgs/cross-armv7l-linux-musleabihf/patches/fix-_stat-sed,patch`
```
--- gcc-9.3.0/libgo/mksysinfo.sh        2020-11-29 23:07:46.793838127 +0100
+++ gcc-9.3.0/libgo/mksysinfo.sh        2020-11-29 23:27:18.520794067 +0100
@@ -506,9 +506,9 @@
          -e 's/st_size/Size/' \
          -e 's/st_blksize/Blksize/' \
          -e 's/st_blocks/Blocks/' \
-         -e 's/st_atim/Atim/' \
-         -e 's/st_mtim/Mtim/' \
-         -e 's/st_ctim/Ctim/' \
+         -e 's/st_atim/Atim/g' \
+         -e 's/st_mtim/Mtim/g' \
+         -e 's/st_ctim/Ctim/g' \
          -e 's/\([^a-zA-Z0-9_]\)_timeval\([^a-zA-Z0-9_]\)/\1Timeval\2/g' \
          -e 's/\([^a-zA-Z0-9_]\)_timespec_t\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \
          -e 's/\([^a-zA-Z0-9_]\)_st_timespec_t\([^a-zA-Z0-9_]\)/\1StTimespec\2/g' \
```

So basically the replacement needs to take place on the entire line. This is because before the `st_atim` etc. there is a `__st_atim32` which is replaced and the `sed` is done without modifying the interesting `st_atim` which follows.

Perhaps you @ericonr can update the branch to upstream master once more?
And we should integrate this patch with `gcc` and use the `cross-*-musl/files/something.patch` symbolic links to the `gcc/patches/something.patch` style for it.

I think I could now build all packages for `armv7l-musl` which will take about 2 days.