Revert "changed makevars to allow compiling (and properly including their header files) cpp code from inst/include."
as it gave compiler errors on stupid windows

This reverts commit ddbc2a6c712e3018c57e1fe41d89c9796bd5bdab.
forgot to add new files from latest vcglib update
redid the makevars thingy but this time added ./*.cpp in in wildcards explicitely (stupid windows)