add OpenBLAS_VERSION to cmake config file

usually these files are more often located in this subdir

If you "make PREFIX=/path/to/OpenBLAS install" ,
The config file will be located in /path/to/OpenBLAS/cmake

Then, you can use "find_package(OpenBLAS)" at CMake.
cmake -DOpenBLAS_DIR=/path/to/OpenBLAS/cmake ..

Conflicts:
	driver/others/memory.c

This is MinGW convention.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

Static library is still built for shared lib generation.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

Use install command instead of cp to install files with permissions control.

PREFIX wasn't communicated to Makefile.install (where it matters)
by Makefile. The result is that the default PREFIX is empty and
OpenBLAS was being installed in /lib.

Since the DLL now has a fixed name there is no need to install a versioned alias too.

Used $(CURDIR) instead of pwd in generating shared library on Mac OSX.
Add more tips about this issue. Thank Dr Kane O'Donnell.

OSX cann't use relative path in shared library. Thank Mr.Kane for this patch. The detail is in this link (https://github.com/xianyi/OpenBLAS/issues/57).