Two changes in the -r1:
1. || die added to all three invoke calls — failures were silently ignored before, leaving an invalid libcrypto.a
that only blew up at link time with the cryptic "file format not recognized" error.
2. Strip -Werror=implicit-function-declaration and -Werror=implicit-int from CFLAGS/CXXFLAGS before invoking —
invoke inherits the full portage environment, so the tinderbox's strict clang flags were being passed into the
OpenSSL 1.0.2e build.
