Remove AmiraMesh flags from the Makefile.am created by the duneproject script

The AmiraMesh format is so obscure that we should not clutter the code we
generate by references to it.  If people really want AmiraMesh support they
can still add the flags, just like they have to do for many other things.

bin/duneproject

@@ -613,7 +613,6 @@ ${CMODULE}_SOURCES = $CMODULE.cc
 ${CMODULE}_CPPFLAGS = \$(AM_CPPFLAGS) \\
 	\$(DUNEMPICPPFLAGS) \\
 	\$(UG_CPPFLAGS) \\
-	\$(AMIRAMESH_CPPFLAGS) \\
 	\$(ALBERTA_CPPFLAGS) \\
 	\$(ALUGRID_CPPFLAGS)
 # The libraries have to be given in reverse order (most basic libraries
@@ -624,14 +623,12 @@ ${CMODULE}_LDADD = \\
 	\$(DUNE_LDFLAGS) \$(DUNE_LIBS) \\
 	\$(ALUGRID_LDFLAGS) \$(ALUGRID_LIBS) \\
 	\$(ALBERTA_LDFLAGS) \$(ALBERTA_LIBS) \\
-	\$(AMIRAMESH_LDFLAGS) \$(AMIRAMESH_LIBS) \\
 	\$(UG_LDFLAGS) \$(UG_LIBS) \\
 	\$(DUNEMPILIBS)	\\
 	\$(LDADD)
 ${CMODULE}_LDFLAGS = \$(AM_LDFLAGS) \\
 	\$(DUNEMPILDFLAGS) \\
 	\$(UG_LDFLAGS) \\
-	\$(AMIRAMESH_LDFLAGS) \\
 	\$(ALBERTA_LDFLAGS) \\
 	\$(ALUGRID_LDFLAGS) \\
 	\$(DUNE_LDFLAGS)