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The current rule for the binaries is:

glew.bin: glew.lib bin bin/$(GLEWINFO.BIN) bin/$(VISUALINFO.BIN)

In parallel builds, all of those targets happen at the same time. This
means that 'bin' can happen *after* 'bin/$(GLEWINFO.BIN)', which is a
problem as the 'bin' target's responsibility is to create the directory
that the other target writes into.

Solve this by not having a separate 'create directory' target which is
fundamentally racy, and simply mkdir in each target which writes into it.

Software should install to /usr/local by default, as /usr is for the
operating system managed libraries.

Closes #52.

https://github.com/nigels-com/glew/issues/264

Paths should be created using os.path.join with this way is platform
independent.

Raw open should be avoided to prevent that in case of an exception
the file is not closed.
This also has the advantage that if the user forgets to call close
the file is still closed.

There is a small typo in auto/src/glew_head.c.

Should read `directly` rather than `direcly`.

Allow LGTM.com use the custom configuration to analyze C++ code of the project