build/make/Makefile.in: Restore variable OPTIONAL_INSTALLED_PACKAGES

Author: Matthias Koeppe

build/make/Makefile.in

@@ -99,7 +99,8 @@ GCC_DEP = @SAGE_GCC_DEP@
 @SAGE_PACKAGE_TREES@
 
 # All standard/optional/experimental installed packages (triggers the auto-update)
-INSTALLED_PACKAGES = @SAGE_OPTIONAL_INSTALLED_PACKAGES@
+OPTIONAL_INSTALLED_PACKAGES = @SAGE_OPTIONAL_INSTALLED_PACKAGES@
+INSTALLED_PACKAGES = $(OPTIONAL_INSTALLED_PACKAGES)
 INSTALLED_PACKAGE_INSTS = \
     $(foreach pkgname,$(INSTALLED_PACKAGES),$(inst_$(pkgname)))