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

Issue #990 resolved
Former user created an issue

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