1.Make directed_test apps linked against static libs
of hip, rocclr, rocr, roct and amd_comgr.
2.Remove custom_target amdhip64_static_combiner.
3.Support EXCLUDE_HIP_LIB_TYPE <static|shared>.
4.Simplify argument list parsing.
5.Fix hip_pch.o missing issue in samples' build.
6.Fix some original small bugs.
Change-Id: I30f5e65367613152ce86b80b13e1c9f2a28da803
* Enabled gcc for hip host code
* Adding tests for hip code + (gcc & g++), without kernels
* Excluding nvcc platforms for gcc and g++ tests + Addressing review comments
* minor code clean-up
* Add rocm include path
* Added relative path for library
* Hiding non supported functions for gcc
* Incorporating review comments