Remove 'make -f cudacpp -pn' to determine CUDACPP_BUILDDIR in madevent makefile

[valassi]

While integrating Jorgen's makefile changes for separate targets in PR #798, I am removing the 'make -f cudacpp -pn' to determine CUDACPP_BUILDDIR in madevent makefile. This is one of the most horrible hacks I had included in the makefiles.

For this one, I am just adding a separate makefile included by both cudacpp.mk an dthe fortran makefile. This was one of the options we discussed in December. This is essentially done. Filing this for reference, cross linked with the relevant changes.

[valassi]

This is completed in PR #798. There is a new cudacpp_builddir.mk file.