[repacker] begin adding PairPos splitting support.

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index 7e1fb3b..9940bb6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -411,7 +411,7 @@
 test_priority_queue_CPPFLAGS = $(HBCFLAGS)
 test_priority_queue_LDADD = libharfbuzz.la $(HBLIBS)
 
-test_repacker_SOURCES = test-repacker.cc hb-static.cc graph/gsubgpos-graph.cc
+test_repacker_SOURCES = test-repacker.cc hb-static.cc graph/gsubgpos-context.cc
 test_repacker_CPPFLAGS = $(HBCFLAGS)
 test_repacker_LDADD = libharfbuzz.la libharfbuzz-subset.la $(HBLIBS)