Build error with clang

[ossy-szeged]

We build openwebrtc-gst-plugins in WebKit project with jhbuild
and got the following build error:

In file included from gstvideorepair.c:30:
In file included from ./gstvideorepair.h:29:
In file included from /home/webkit/WebKit/WebKitBuild/DependenciesEFL/Root/include/gstreamer-1.0/gst/gst.h:88:
/home/webkit/WebKit/WebKitBuild/DependenciesEFL/Root/include/gstreamer-1.0/gst/gstcompat.h:54:38: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality]
if (((((GstPad_)(pad))->direction) == GST_PAD_SRC))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/home/webkit/WebKit/WebKitBuild/DependenciesEFL/Root/include/gstreamer-1.0/gst/gstcompat.h:54:38: note: remove extraneous parentheses around the comparison to silence this warning
if (((((GstPad_)(pad))->direction) == GST_PAD_SRC))
~ ^ ~
/home/webkit/WebKit/WebKitBuild/DependenciesEFL/Root/include/gstreamer-1.0/gst/gstcompat.h:54:38: note: use '=' to turn this equality comparison into an assignment
if (((((GstPad*)(pad))->direction) == GST_PAD_SRC))
^~
=
1 error generated.

---

line54: if (GST_PAD_IS_SRC (pad))

Of course this warning can be silenced in gstreamer with fixing this line, but
"if GST_PAD_IS_SRC (pad)" would be very ugly. Additionally Wparentheses-equality
isn't a useful warning at all, it would be better to simply suppress it.

I'm going to suppress this warning in WebKit - https://bugs.webkit.org/show_bug.cgi?id=145837,
but it would be great if we can fix it in the upstream too.

[ossy-szeged]

#45 wasn't accepted and I don't have time to find better fix, feel free to pick it up, if anybody else is interested in fixing this issue.