Add support for muslc on Linux

Old text:

Hello,

I am trying to run the Tor Browser on Alpine Linux in a VM. Unfortunately, the program would not start at the beginning. After installing some packages it worked: apk add build-base gcompat libc6-compact Now the following error message appears:

./start-tor-browser --verbose
mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_settype failed: Invalid argument
./start-tor-browser: line 362:  4658 Segmentation fault      TOR_CONTROL_PASSWD=${TOR_CONTROL_PASSWD} ./firefox --class "Tor Browser" -profile TorBrowser/Data/Browser/profile.default "${@}" < /dev/null

How can I start the Tor Browser?

From @pierov's comment below:

Mozilla uses some glibc's non-standard (read POSIX) behavior. For this reason, Mozilla official binaries aren't compatible with Alpine, which uses musl libc. Alpine uses a set of patches to compile Firefox with musl libc in the version they package.

Tor Browser is in the same situation: I think that with the same patches and some toolchain magic, it could be compiled with muslc.

It would be interesting, imho, but I suppose we won't be interested, until Moz upstreams the required patches (I don't even know if their authors asked Moz to).