Removed gtmroutines parsing dependency on MUnit testing

The 'gtmroutines' environment variable is parsed to extract GT.M source
directories irrespective of whether TEST_VISTA_MUNIT is checked or not.

OSEHRA-Id: http://issues.osehra.org/browse/OAT-76
Change-Id: Id48541dd8e18a16f109898b88621ab5e0aeed1f2