[gnumeric] Compilation: destdir fix from Redhat.

[Morten Welinder <mortenw src gnome org>]

commit 798755af32c42e395d167d9d49d14cbe449d2842
Author: Morten Welinder <terra gnome org>
Date:   Tue Jan 31 18:26:55 2017 -0500

    Compilation: destdir fix from Redhat.

 doc/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 7e3f9a4..52a011d 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -527,7 +527,7 @@ HELP_MEDIA= \
 
 install-exec-hook:
        for d in C $(HELP_LINGUAS); do \
-               helpdir="$(HELP_DIR)/$$d/$(HELP_ID)"; \
+               helpdir="$(DESTDIR)$(HELP_DIR)/$$d/$(HELP_ID)"; \
                install -d $$helpdir; \
                $(RM) $$helpdir/index.docbook; \
                $(LN_S) gnumeric.xml $$helpdir/index.docbook; \
@@ -535,7 +535,7 @@ install-exec-hook:
 
 uninstall-hook:
        for d in C $(HELP_LINGUAS); do \
-               helpdir="$(HELP_DIR)/$$d/$(HELP_ID)"; \
+               helpdir="$(DESTDIR)$(HELP_DIR)/$$d/$(HELP_ID)"; \
                $(RM) $$helpdir/index.docbook; \
        done