Make perl_makemaker work properly when in source building is enforced.

This is backwards compatible (with << 7.3) until build, test and clean steps
are not reimplemented in the backwards compatibility breaking way. However,
this is absolutely necessary for enforce_in_source_building() to work in corner
cases (when build directory is set) in build, test and clean steps as the next
class (makefile) does not enforce it. makefile will fail as it will look for
Makefile in the build directory rather than the source directory.

Signed-off-by: Modestas Vainius <modestas@vainius.eu>

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