Remove instances of the 'gas2masm' project

Remove the directories 'QW\gas2masm', and 'WinQuake\gas2masm' that
include the files that build the 'gas2masm' tool used to convert between
GNU Assembly and the Microsoft Assembler.

While the source files of the project do _not_ differ, __the build
system does__. Since the end goal is to integrate QuakeWorld and
WinQuake/glQuake there is no point having multiple instances of this
tool.

Moving 'gas2masm' to its own repository allows the unification of
changes to its source.