CMake: Improve detection of YAEP
#
# .
-find_path (YAEP_INCLUDE_DIR NAMES yaep.h)
+find_path (YAEP_INCLUDE_DIR NAMES yaep.h PATH_SUFFIXES yaep)
find_library (YAEP_LIBRARY NAMES yaep)
find_library (YAEP_LIBRARY_CPP NAMES yaep++)
