Replace references of WORKDIR with UNPACKDIR where it makes sense to do
so in preparation for changing the default value of UNPACKDIR.
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Disable on musl since its using some non-portable glibc only constructs
Drop gettid patch its applied upstream
Signed-off-by: Khem Raj <raj.khem@gmail.com>