Meson: Change extra-checks to feature option and make it yielding
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-rw-r--r-- 1096 AUTHORS
-rw-r--r-- 25299 COPYING
-rw-r--r-- 4547033 ChangeLog
-rw-r--r-- 384 MAINTAINERS
-rw-r--r-- 59648 NEWS
-rw-r--r-- 9133 README
-rw-r--r-- 7796 README.static-linking
-rw-r--r-- 3784 RELEASE
drwxr-xr-x - data
drwxr-xr-x - docs
-rw-r--r-- 1194 gst-element-check-1.0.m4
drwxr-xr-x - gst
-rw-r--r-- 30684 gstreamer.doap
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-rw-r--r-- 17752 meson.build
-rw-r--r-- 3488 meson_options.txt
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drwxr-xr-x - po
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drwxr-xr-x - tests
drwxr-xr-x - tools