BUG: distutils: prefix library name

In linux and particulary MinGW on windows, library names may
be prefixed with "lib." However, if the library name is prefixed
with "lib" on MSVC or ABI-equivalent (clang/intel), the prefix should
not be excluded from the library name. This caused system_info
to find "libopenblas" or "libsuitesparse" but then add "openblas"
to the library names, which is of course problematic because
MSVC would not look for "libopenblas" but rather "openblas."

numpy/distutils/system_info.py

@@ -804,6 +804,8 @@ def _find_lib(self, lib_dir, lib, exts):
                 # doesn't seem correct
                 if ext == '.dll.a':
                     lib += '.dll'
+                if ext == '.lib':
+                    lib = prefix + lib
                 return lib
 
         return False