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Remove some unneeded libs & headers

Martin Erik Werner requested to merge arand/lugaru:remove-unneeded-libs into master

Based on some hints by the automatic dependency checking in Debian packaging[0], it appears that, at least on Debian GNU/Linux, quite a few of the libs that lugaru links against are not needed.

Remove linking to those libs, and use of related unneeded headers.

  • For ogg/vorbis, it seems like libogg is not needed unless handling container metadata?

  • For opengl, there seems to be only a subset of the libs that are required. Notably the glext.h header seems to only be needed on windows for GL_GENERATE_MIPMAP, but not otherwise.

  • For zlib it seems to be unused, but removing zlib.h exposed a dependency on unistd.h which is now included directly on non-windows.

[0]

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libz.so.1 (it uses
none of the library's symbols)

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libSM.so.6 (it
uses none of the library's symbols)

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libX11.so.6 (it
uses none of the library's symbols)

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libogg.so.0 (it
uses none of the library's symbols)

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libXext.so.6 (it
uses none of the library's symbols)

dpkg-shlibdeps: warning: package could avoid a useless dependency if
debian/lugaru/usr/games/lugaru was not linked against libICE.so.6 (it
uses none of the library's symbols)
Edited by Rémi Verschelde

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