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The problem with ignore_output is that it hides errors for WAY=ghci.
GHCi always returns with exit code 0 (unless it is broken itself).

For example: ghci015 must have been failing with compile errors for
years, but we didn't notice because all output was ignored.

Therefore, replace all uses of ignore_output with either ignore_stderr
or ignore_stdout. In some cases I opted for adding the expected output.

Update submodule hpc and stm.

Reviewed by: simonmar

Differential Revision: https://phabricator.haskell.org/D2367

update test

Add ghcpkg04 tests, and pkg01 (test that compiling a module that is
also a package module gives an error).