New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/23390#discussion_r624846491

Comment:
Ok, errors happen here:

```
Compiling juce_audio_processors.cpp
In file included from ../../includes/vst3sdk/pluginterfaces/base/ftypes.h:19,
                 from ../../includes/vst3sdk/pluginterfaces/base/fstrdefs.h:19,
                 from ../../includes/vst3sdk/pluginterfaces/vst/vsttypes.h:19,
                 from format_types/juce_VST3Headers.h:102,
                 from format_types/juce_VST3PluginFormat.cpp:28,
                 from juce_audio_processors.cpp:152:
../../includes/vst3sdk/pluginterfaces/base/fplatform.h:188: warning: ignoring '#pragma error unknown' [-Wunknown-pragmas]
  188 |  #pragma error unknown platform
      | 
In file included from format_types/juce_VST3Headers.h:109,
                 from format_types/juce_VST3PluginFormat.cpp:28,
                 from juce_audio_processors.cpp:152:
../../includes/vst3sdk/base/source/fstring.cpp:1998:2: warning: #warning DEPRECATED No Linux implementation [-Wcpp]
 1998 | #warning DEPRECATED No Linux implementation
      |  ^~~~~~~
In file included from format_types/juce_VST3Headers.h:112,
                 from format_types/juce_VST3PluginFormat.cpp:28,
                 from juce_audio_processors.cpp:152:
../../includes/vst3sdk/base/thread/source/flock.cpp:81:2: warning: #warning implement FLock! [-Wcpp]
   81 | #warning implement FLock!
      |  ^~~~~~~
In file included from format_types/juce_VST3Headers.h:120,
                 from format_types/juce_VST3PluginFormat.cpp:28,
                 from juce_audio_processors.cpp:152:
../../includes/vst3sdk/pluginterfaces/base/funknown.cpp:78:2: warning: #warning implement me! [-Wcpp]
   78 | #warning implement me!
      |  ^~~~~~~
In file included from format_types/juce_VST3Headers.h:122,
                 from format_types/juce_VST3PluginFormat.cpp:28,
                 from juce_audio_processors.cpp:152:
../../includes/vst3sdk/pluginterfaces/base/ustring.cpp:163:2: warning: #warning Implement me [-Wcpp]
  163 | #warning Implement me
      |  ^~~~~~~
../../includes/vst3sdk/pluginterfaces/base/ustring.cpp:201:2: warning: #warning Implement me [-Wcpp]
  201 | #warning Implement me
      |  ^~~~~~~
../../includes/vst3sdk/pluginterfaces/base/ustring.cpp:228:2: warning: #warning Implement me [-Wcpp]
  228 | #warning Implement me
      |  ^~~~~~~
../../includes/vst3sdk/pluginterfaces/base/ustring.cpp:267:2: warning: #warning Implement me [-Wcpp]
  267 | #warning Implement me
      |  ^~~~~~~
Creating juce_audio_basics.a
make[1]: Leaving directory '/builddir/Carla-2.3.0/source/modules/juce_audio_basics'
make[1]: Entering directory '/builddir/Carla-2.3.0/source/modules/juce_core'
Compiling juce_core.cpp
In file included from juce_core.cpp:69:
/usr/aarch64-linux-musl/usr/include/sys/errno.h:1:2: warning: #warning redirecting incorrect #include <sys/errno.h> to <errno.h> [-Wcpp]
    1 | #warning redirecting incorrect #include <sys/errno.h> to <errno.h>
      |  ^~~~~~~
juce_core.cpp:95:12: fatal error: execinfo.h: No such file or directory
   95 |   #include <execinfo.h>
      |            ^~~~~~~~~~~~
compilation terminated.
```

some of the macros weren't enough.