Convert svn:ignore properties to .gitignore.

.gitignore

+
+# /
+/Makefile
+/Makefile.in
+/config.*
+/configure
+/dependencies.m4
+/aclocal.m4
+/autom4te.cache
+/depcomp
+/install-sh
+/missing
+/mkinstalldirs
+/libtool
+/dune.pc
+/semantic.cache
+/stamp-h1
+/html
+/.deps
+/.libs
+/am
+/linelast
+/nonlinelast
+
+# /dune-elasticity/
+/dune-elasticity/semantic.cache
+
+# /m4/
+/m4/Makefile.in
+/m4/Makefile
+
+# /test/
+/test/.deps
+/test/.libs
+/test/Makefile
+/test/Makefile.in
+/test/semantic.cache