pkgconfig file CEGUI-<MAJOR_VERSION>.pc has wrong include dir

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Issue #990 resolved
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Automatic migration. Original reporter: "dermont"

Here on Linux the header files are installed under <install_prefix>/include/ cegui-o/CEGUI.

The CMAKE_PROJECT_NAME is lower case "cegui". The 2nd include from the .pc file becomes <install_prefix>/include/cegui-o/cegui. Same issue for trunk etc.

This does not affect the build or using CEGUI.

CEGUI-0.pc Cflags: -I${includedir} -I${includedir}/cegui

CEGUI.pc.in Cflags: -I${includedir} -I${includedir}/@CMAKE_PROJECT_NAME@

Reproducibility: always