Adding basic support of benchmarks into CMake

Write xerbla.c.o into archive regardless of timestamp by using ar -rs
instead of ar -ru.

Allow weak linking on old macOS

This avoid problems when build and install 64 and 32 bits libs at same time,
because both overwrite the .cmake files if install it in an non-architecture depend path
like is `share/cmake/foo` is.

cmake now pick the correct .cmake files when try to add to another project as depencies

* Do not build the tests when only the CBLAS interface is selected

Fix USE_PERL option usage

Once you define the USE_PERL variable it is always set as DEFINED regardless of its value. One should chack for the actual variable value.

* Add C conversions of the CBLAS tests for NOFORTRAN=1 builds

* Enable CTEST without Fortran and fix passing of BUILD_vartype options to exports/gensymbol

* Add C equivalents of the Fortran routines from Reference-LAPACK as fallbacks, and C_LAPACK variable to trigger their use

* Use linker response files and a custom link command to get around ARG_MAX limitations on OSX
* Reconfigure a redundant job on Azure to test shared library builds with CMAKE and DYNAMIC_ARCH on OSX

When both BUILD_SHARED_LIBS and BUILD_STATIC_LIBS are enabled,
cmake export both of them to OpenBLASTargets under tha same name `OpenBLAS::OpenBLAS`
which leads to fatal error about OpenBLAS::OpenBLAS being both static and shared target.
This change makes cmake export only the shared library in that case.
There is another solution to treat them as components,
but I am afraid that will make it backward incompatible.

Add some extra lines and indentations.