[Bug 761718] common: Create necessary directory if introspection scanning is disabled

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761718

--- Comment #3 from Sebastian Rasmussen <sebras at hotmail.com> ---
__tim had problems reproducing this and asked for a detailed way of reproducing
the issue at hand:

git clone git://anongit.freedesktop.org/gstreamer/gstreamer
git submodule update --init
./autogen.sh --enable-gtk-doc --enable-gtk-doc-html
# the line below simulates an empty .types-file, which should work
# as I understand the if grep-line for the scan-build.stamp rule in
# common/gtk-doc.mak
echo '' > docs/libs/gstreamer-libs.types
make -j10
[...]
make -C libs
make[4]: Entering directory '/tmp/gstreamer/docs/libs'
  DOC   Scanning header files
touch: cannot touch ‘.libs/gstreamer-libs-scan.o’: No such file or directory
Makefile:865: recipe for target 'scan-build.stamp' failed
make[4]: *** [scan-build.stamp] Error 1 

I hope this helps.

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