Fabrice Fontaine authored Nov 20, 2021 and Rico Tzschichholz committed Nov 30, 2021

Include Makefile.introspection instead of using a custom rule which will
result in the following build failure when cross-compiling on buildroot
because of missing --includedir:

/home/giuliobenetti/autobuild/run/instance-1/output-1/host/bin/../riscv32-buildroot-linux-gnu/sysroot/usr/bin/g-ir-compiler -l `/usr/bin/sed -nE "s/^dlname='([A-Za-z0-9.+-]+)'/\1/p" libgee-0.8.la` -o Gee-0.8.typelib Gee-0.8.gir libgee-0.8.la
Could not find GIR file 'GObject-2.0.gir'; check XDG_DATA_DIRS or use --includedir
error parsing file Gee-0.8.gir: Failed to parse included gir GObject-2.0

Fixes:
 - http://autobuild.buildroot.org/results/884faa0f84c8dc43ed1ca6cde9caf21c731a4b35



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>