Makefile: Use shell pwd instead of GIT_DIR
Makefile: Use shell pwd instead of GIT_DIR

GIT_DIR is defined in magic.mk, which is not included in the root
Makefile. Using shell pwd until a permanent decision is made.

HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA