build: disable libxcb extensions

Summary:
```
Because we pass -qt-xcb to Qt, it will compile in a set of xcb helper
libraries and extensions.
So skip building all of the libxcb extensions when we build libcxb in
depends.

More info is available  here:
https://doc.qt.io/qt-5.9/linux-requirements.html
```

Backport of core [[bitcoin/bitcoin#16533 | PR16533]].

Test Plan: Run the Linux Gitian builds.

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D5633

depends/packages/libxcb.mk

@@ -7,6 +7,18 @@ $(package)_dependencies=xcb_proto libXau xproto
 
 define $(package)_set_vars
 $(package)_config_opts=--disable-static
+# Because we pass -qt-xcb to Qt, it will compile in a set of xcb helper libraries and extensions,
+# so we skip building all of the extensions here.
+# More info is available from: https://doc.qt.io/qt-5.9/linux-requirements.html
+$(package)_config_opts += --disable-composite --disable-damage --disable-dpms
+$(package)_config_opts += --disable-dri2 --disable-dri3 --disable-glx
+$(package)_config_opts += --disable-present --disable-randr --disable-record
+$(package)_config_opts += --disable-render --disable-resource --disable-screensaver
+$(package)_config_opts += --disable-shape --disable-shm --disable-sync
+$(package)_config_opts += --disable-xevie --disable-xfixes --disable-xfree86-dri
+$(package)_config_opts += --disable-xinerama --disable-xinput --disable-xkb
+$(package)_config_opts += --disable-xprint --disable-selinux --disable-xtest
+$(package)_config_opts += --disable-xv --disable-xvmc
 endef
 
 define $(package)_preprocess_cmds