Add HOST_COMPILER_VERSION and HOST_COMPILER_STD for each module

[emrainey]

HOST_COMPILER_VERSION should be able to be set per module, and would indicate required compiler version. Unset by default. Example: HOST_COMPILER=GCC HOST_COMPILER_VERSION=4.8 or HOST_COMPILER=CLANG HOST_COMPILER_VERSION=3.5

HOST_COMPILER_STD should be able to be set per module and would indicate the standards information that each compiler may be able to support. Example (cont'd): HOST_COMPILER_STD=c++11 HOST_COMPILER_STD=c99