Update release-0.3.0 branch to match develop

Revert " Switch mips32 target to USE_TRMM to fix complex TRMM"

... as it was just a silly workaround for the issue seen in #1563, caused by #1419

Remove extraneous brace from previous commit of mips dsdot fix

Revert changes from PR#1419

at least one of these changes apparently is an oversimplification, leading to TRMM breakage on some platforms as observed in #1563

Use correct data type for initializers of v2f64, v4f32

Fixes #1561

Add build-time configuration options to pkgconfig file

Overwrite any pre-existing openblas.pc rather than append to it

Add threading and OpenMP information to output

For #1416 and #1529, more information about the options OpenBLAS was built with is needed. Additionally we may want to add this data to the openblas.pc file (but not all projects use pkgconfig, and as far as I am aware the cmake module for accessing it does not make such "private" declarations available)

move _Atomic define to common.h

Change _STDC_VERSION__ to __STDC_VERSION__

Change-Id: Id3fa4e8d9eedd4ef7230df69b611e7f397301a42

Fix race condition in blas_server_omp.c

LAPACKE fixes from lapack PR249

Copied from Reference-LAPACK/lapack#249, this fixes out-of-bounds memory accesses
in the nancheck calls of the LAPACKE lacgv, lassq,larfg,larfb,larfx and mtr functions

Change -openmp to -fopenmp for ifort entry as well

Fixes for ifort 2018

Update compiler flag for openmp use with ICC

Drop C-style "L" suffx from OPENMP version number tests in the LAPACK source

1. the already deprecated -openmp option was removed in 2018, switch to -fopenmp
2. add leading blank in search for "zho_ge__" symbol to work around misleading tags in the 2018 assembly
Expected to fix #1548

The deprecated -openmp option was finally removed in favor of -qopenmp or -fopenmp, picking the latter to stay compatible with Intel compiler versions before 2015 (when -q options were introduced). Fixes #1546

Fix MIPS32 build and add MIPS 1004K cpu (MT7621 SOC)

Avoid out-of-bounds accesses in blas_quickdivide on big X86 systems

Should fix #1541

Disable multithreading in ztrmv

Use _Atomic instead of volatile for thread safety where C11 is supported

Change-Id: Ic896276cd073d6b41930c7c5a29d66348cd1725d