Parallel build failure in rate/ (probably rate-lav/, pph/ too)

[GitHub issues - edited]

alsa-project/alsa-plugins issue #44 was edited from thesamesam:

Originally reported downstream in [Gentoo](https://bugs.gentoo.org/835920) by a user.

It looks like in `rate/Makefile.am` (and I think ditto for `rate-lav/Makefile.am`, `pph/Makefile.am`), with high parallelism (`make -jN install`, for large N), `$(DESTDIR)@ALSA_PLUGIN_DIR@` may not have been created yet. All of these dirs override `install-exec-hook`.

For other subdirs, like `jack/Makefile.am`, there's no problem, because the implementation of `install-exec-hook` for those is set by `install-hooks.am` which handles `mkdir -p` before symlinking/installing.

Example of failure:
```
>>> Install media-plugins/alsa-plugins-1.2.2 into /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image
 * abi_x86_64.amd64: running multilib-minimal_abi_src_install
make -j2 DESTDIR=/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image install 
Making install in doc
make[1]: Entering directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/doc'
make[2]: Entering directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/doc'
make[2]: Nothing to be done for 'install-exec-am'.
make[2]: Nothing to be done for 'install-data-am'.
make[2]: Leaving directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/doc'
make[1]: Leaving directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/doc'
Making install in rate
make[1]: Entering directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
make[2]: Entering directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
make  install-exec-hook
 /bin/mkdir -p '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/share/alsa/alsa.conf.d'
make[3]: Entering directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
rm -f /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib/libasound_module_rate_samplerate_*.so
ln -s libasound_module_rate_samplerate.so /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib/libasound_module_rate_samplerate_best.so
 /usr/bin/install -c -m 644 /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2/rate/10-samplerate.conf '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/share/alsa/alsa.conf.d'
ln: failed to create symbolic link '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib/libasound_module_rate_samplerate_best.so': No such file or directory
make[3]: *** [Makefile:738: install-exec-hook] Error 1
make[3]: Leaving directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
make[2]: *** [Makefile:651: install-exec-am] Error 2
make[2]: *** Waiting for unfinished jobs....
 /bin/mkdir -p '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib'
 /bin/sh ../libtool   --mode=install /usr/bin/install -c   libasound_module_rate_samplerate.la '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib'
libtool: install: /usr/bin/install -c .libs/libasound_module_rate_samplerate.so /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib/libasound_module_rate_samplerate.so
libtool: install: /usr/bin/install -c .libs/libasound_module_rate_samplerate.lai /var/tmp/portage/media-plugins/alsa-plugins-1.2.2/image/usr/lib64/alsa-lib/libasound_module_rate_samplerate.la
libtool: warning: remember to run 'libtool --finish /usr/lib64/alsa-lib'
make[2]: Leaving directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
make[1]: *** [Makefile:594: install-am] Error 2
make[1]: Leaving directory '/var/tmp/portage/media-plugins/alsa-plugins-1.2.2/work/alsa-plugins-1.2.2-abi_x86_64.amd64/rate'
make: *** [Makefile:444: install-recursive] Error 1
 * ERROR: media-plugins/alsa-plugins-1.2.2::gentoo failed (install phase):
 *   emake failed
```

Reported to happen with 1.2.6 too, which makes sense, as nothing changed there.

Issue URL     : https://github.com/alsa-project/alsa-plugins/issues/44
Repository URL: https://github.com/alsa-project/alsa-plugins