Don't parse cpp files with Doxygen.

It messes with my function order and I ain't got no time for that.

Doxyfile

@@ -877,8 +877,7 @@ INPUT_ENCODING         = UTF-8
 # C comment), *.py, *.pyw, *.f90, *.f95, *.f03, *.f08, *.f, *.for, *.tcl, *.vhd,
 # *.vhdl, *.ucf, *.qsf and *.ice.
 
-FILE_PATTERNS          = *.cpp \
-                         *.h \
+FILE_PATTERNS          = *.h \
                          *.hpp \
                          *.dox