[gnumeric] install: respect DESTDIR in introspection.

[Morten Welinder <mortenw src gnome org>]

commit 8dab1b3061e1635740aa3893271e1910441a6c1d
Author: Morten Welinder <terra gnome org>
Date:   Thu Oct 31 19:23:41 2019 -0400

    install: respect DESTDIR in introspection.
    
    Fixes #344.

 introspection/Makefile.am | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/introspection/Makefile.am b/introspection/Makefile.am
index 284bf3bae..524e4eb56 100644
--- a/introspection/Makefile.am
+++ b/introspection/Makefile.am
@@ -5,9 +5,9 @@ EXTRA_DIST = README                     \
 if HAVE_INTROSPECTION
 if HAVE_PYTHON_GI
 install-data-local:
-       install -D -m 0444 -t @GIOVERRIDESDIR@ gi/overrides/Gnm.py
+       install -D -m 0444 -t $(DESTDIR)@GIOVERRIDESDIR@ gi/overrides/Gnm.py
 
 uninstall-local:
-       rm -f @GIOVERRIDESDIR@/Gnm.py
+       rm -f $(DESTDIR)@GIOVERRIDESDIR@/Gnm.py
 endif
 endif