Remove undocumented Amalgamated header option

Christoph Junghansrequested to merge
no_Amalgamated into master

stb_include has a couple of security issue (see https://github.com/nothings/stb/issues/1750), hence I looked where in ALL it is actually used and it basically only used to amalgamate the ALL.hpp header into ALL_Amalgamated.hpp. This header is only used in the example and only if one used the undocumented option USE_AMALGAMATED or the easiest would be to just remove it. No functionality gets lost by this.

The way how ALL_Amalgamated.hpp is made also doesn't work when cross-compiling.

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