pango: remove sed -i, remove network requirement

extra/pango/build

@@ -2,8 +2,13 @@
 
 export DESTDIR="$1"
 
-sed -i "/subdir('tests')/d"    meson.build
-sed -i "/subdir('examples')/d" meson.build
+# First substitution disables weird case where build may try to git clone
+# some repository related to documentation.
+sed -e "s/'gi-docgen', '/'/" \
+    -e "/subdir('tests')/d" \
+    -e "/subdir('examples')/d" \
+    meson.build > _
+mv -f _ meson.build
 
 meson \
     --prefix=/usr \