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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 761718
           Summary: common: Create necessary directory if introspection
                    scanning is disabled
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: common
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sebras at hotmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

If disabling GObject introspection scanning for documentation the build fails.
I tested this by cloning the most recent gstreamer git, then emptying
docs/libs/gstreamer-libs.types and then running ./configure --enable-gtk-doc
--enable-gtk-doc-html --enable-gtk-doc-pdf --enable-docbook and then make -j10
after which I ended up with the following error:

[...]
make[4]: Entering directory '$HOME/src/gst/gstreamer/docs/libs'
  DOC   Scanning header files
touch: cannot touch ‘.libs/gstreamer-libs-scan.o’: No such file or directory
Makefile:862: recipe for target 'scan-build.stamp' failed
make[4]: *** [scan-build.stamp] Error 1
[...]

The reason being that the .libs directory has not been created. So the attached
patch makes sure that the directory is always created if GObject introspection
scanning is diabled.

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