MFH: r563985

e2fsprogs: make build more robust

Depending on external circumstances and options that I have not fully
investigated, several build-time failures occurred that were one of:

• missing symbols in liblzma (static build missed libmd) on some versions with LIBUNWIND enabled
• sometimes /bin/csh being pulled up for scripting, breaking in various places, reason unclear, possibly artifact of next one:
• questionable BASHTESTS handling cleaned up

As these are fixes for a potentially broken build,
no PORTREVISION bump necessary.