commmunity/glm: Fixed constexpr with GCC

[mksully22]

community/gource and community/logstalgia fail to build, generating errors of type:
/usr/include/glm/detail/type_vec2.hpp:90:40: error: 'constexpr const T& glm::vec<2, T, Q>::operator[](glm::vec<2, T, Q>::GLM_FUNC_DECL GLM_CONSTEXPR T const& operator[](length_type i) const;

As discussed in glm issue: g-truc/glm#832
a fix has been committed into glm master branch: g-truc/glm@68c7e7e

Until glm version 0.9.9.4 is released this patch can be backported onto 0.9.9.3 to allow gource and logstaligia packages to build.

[Ikke]

For the record, g-truc/glm@68c7e7e seems to be the commit that breaks it, and the included patch reverts that commit

[Ikke]

Patch didn't apply because the project uses crlf as line ending. I used unix2dos on the patch, and added patch_args="--binary -p1"

[algitbot]

Merged in f7a8723 by @Ikke. Thanks for your contribution!

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