* Do not add -lpthread on Android builds

* Do not add -lpthread on Android cmake builds

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

* Multi-lib distributions need to change the libdir
  which is only portably possible with `GNUInstallDirs`.
* Multi-arch distributions such as Debian and Exherbo
  need to be able to change the bindir.

Update c_check.cmake to label ppc64 as power ARCH

If OpenBLAS is built using add_subdirectory(OpenBlas) as part of another project
then the paths set by CMAKE_XXX_DIR are relative to the parent project
and not the OpenBLAS project.

e.g. Build 32-bit on 64-bit Linux.
cmake -DBINARY=32

Disable CBLAS and LAPACK.

Currently forcing gfortran, instead of assuming ifort.

Instead of generating separate object files for each permutation of
defines for a source file, GenerateNamedObjects now writes an entirely
new source file and inserts the defines as #define c statements.

This solves a problem I ran into with ar.exe where it was refusing to
link objects that had the same filename despite having different paths.

Added zherk_k sources to driver/level3.