tumbler: update to 0.1.30

* find freetype2 by packageconfig -> get out of blacklist
* inherit gtk-doc to avoid
| gtk-doc.make:7: error: GTK_DOC_USE_LIBTOOL does not appear in AM_CONDITIONAL
| docs/reference/tumbler/Makefile.am:84:   'gtk-doc.make' included from here
| gtk-doc.make:59: error: GTK_DOC_BUILD_HTML does not appear in AM_CONDITIONAL
| docs/reference/tumbler/Makefile.am:84:   'gtk-doc.make' included from here
| gtk-doc.make:64: error: GTK_DOC_BUILD_PDF does not appear in AM_CONDITIONAL
| docs/reference/tumbler/Makefile.am:84:   'gtk-doc.make' included from here
| gtk-doc.make:73: error: ENABLE_GTK_DOC does not appear in AM_CONDITIONAL
| docs/reference/tumbler/Makefile.am:84:   'gtk-doc.make' included from here
| gtk-doc.make:294: error: HAVE_GTK_DOC does not appear in AM_CONDITIONAL
| docs/reference/tumbler/Makefile.am:84:   'gtk-doc.make' included from here
| tumblerd/Makefile.am:93: warning: '%'-style pattern rules are a GNU make extension
| autoreconf: automake failed with exit status: 1

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>