Added build with introspection

Makefile

 all:
 	tar xf glib-2.80.3.tar.xz
 	cd glib-2.80.3 && mkdir -p build
-	cd glib-2.80.3/build && meson --prefix=/usr -Dman=false -Dselinux=disabled ..
+	cd glib-2.80.3/build && meson setup .. --prefix=/usr --buildtype=release -D introspection=disabled -D man-pages=disabled
 	cd glib-2.80.3/build && ninja
 	cd glib-2.80.3/build && ninja install
 	mkdir -p /usr/share/doc/glib-2.80.3
 	cp -r glib-2.80.3/docs/reference/{NEWS,gio,glib,gobject} /usr/share/doc/glib-2.80.3
 
+introspection:
+	cd glib-2.80.3/build && meson configure -D introspection=enabled
+	cd glib-2.80.3/build && ninja
+	cd glib-2.80.3/build && ninja install
+
 tests:
 	mkdir glib-home
 	if [[ ! "$(BUILD_OPTIONS)" =~ no-tests ]] ; then \
@@ -14,7 +19,7 @@ tests:
 	    chown -R nobody.nobody glib-2.80.3 glib-home ; \
 	    cd glib-2.80.3/build ; \
 	    su nobody -s /bin/bash -c "HOME=$(CURDIR)/glib-home ninja test" ; \
-	    /usr/bin/truncate --size 0 /etc/machine-id ; \
+	    rm /etc/machine-id ; \
 	fi
 	rm -rf glib-2.80.3
 	rm -rf glib-home