docs/plugins/gst-plugins-bad-plugins.*: Remove equalizer plugin docs

docs/plugins/gst-plugins-bad-plugins.*: Remove equalizer plugin docs

Original commit message from CVS:
* docs/plugins/gst-plugins-bad-plugins.args:
* docs/plugins/gst-plugins-bad-plugins.hierarchy:
* docs/plugins/gst-plugins-bad-plugins.interfaces:
Remove equalizer plugin docs
* tests/check/Makefile.am:
Add GST_OPTION_CFLAGS, to get -Werror -Wall into the tests as for
other modules.
* tests/check/elements/multifile.c:
* tests/check/elements/rganalysis.c:
* tests/check/elements/rglimiter.c:
Fix compiler warnings from -Wall -Werror