documentation/doxygen: support for STRIP_FROM{,_INC}_PATH.

documentation/doxygen: support for STRIP_FROM{,_INC}_PATH.

Doxygen support for STRIP_FROM_INC_PATH is applied to class/struct and
enums through the <includes> xml tag. m.css additionaly shows such
information for functions, enum, namespaces, typedef, variables and
defines through the information extracted from the <location file="xx"/>
tag.

However the location available through the <location file="xx"/> is not
stripped using STRIP_FROM_INC_PATH, only STRIP_FROM_PATH.

This patch provides STRIP_FROM_INC_PATH support by building the prefixes
(STRIP_FROM_INC_PATH stripped from STRIP_FROM_PATH) and stripping the
longest match when constructing the include html.

Co-authored-by: Yuri Edward <nicolas1.fraysse@epitech.eu>
Co-authored-by: Vladimír Vondruš <mosra@centrum.cz>