This commit adds support for a GRAPHVIZ_TARGET_IGNORE_REGEX variable
which can be set() in CMakeGraphVizOptions.cmake.
Targets matching this regex will be skipped when generating the graphviz
graphs.
Alex
In CMakeGraphVizOptions.cmake you can now set GRAPHVIZ_EXECUTABLES,
GRAPHVIZ_STATIC_LIBS, GRAPHVIZ_SHARED_LIBS and GRAPHVIZ_MODULE_LIBS
to TRUE or FALSE depending on whether you want graphs for the
targets of the respective types.
Alex