Remove now redundant implicit parser code from CrayPrgEnv.cmake, as
this function is now supported in the general cmake code
(e.g. Modules/CMakeParseImplicit{Include,Link}Info.cmake).
This simplifies __CrayPrgEnv_setup() to take only one arg (${lang})
and allows us to remove a level of inclusion as
CrayPrgEnv-${lang}.cmake is now compiler independent we
do not need the CrayPrgEnv-${compiler}-${lang} files any more.
This is an extensive refactoring of the Cray compiler wrapper usage.
Using the new compiler wrapper checks, the CrayPrgEnv info files have
been moved from Platform/ to Compiler/. The adjusted naming convention
allows the compiler-wrapper information files to be loaded for both the
CrayLinuxEnvironment platform when cross-compiling and the Linux
platform if building natively on the Cray compute nodes. It also
creates a separation of common arguments for compiler id and language
information used to perform the appropriate introspection of implicit
arguments and libraries used by the compiler wrappers based on the
loaded module environment.
