[babl] build: link extensions against internal .la again

[Øyvind Kolås <ok src gnome org>]

commit 3b51ba011cc122a71619b432310976de999b6cc5
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Sep 25 20:04:54 2017 +0200

    build: link extensions against internal .la again

 extensions/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index ee97919..b103c93 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -66,7 +66,8 @@ ycbcr_la_SOURCES = ycbcr.c
 float_la_SOURCES = float.c
 fast_float_la_SOURCES = fast-float.c
 
-LIBS = $(MATH_LIB) $(THREAD_LIB) -lbabl-0.1
+LIBS =  $(top_builddir)/babl/libbabl-@BABL_API_VERSION@.la \
+       $(MATH_LIB) $(THREAD_LIB)
 
 sse2_float_la_CFLAGS = $(SSE2_EXTRA_CFLAGS)
 sse2_int8_la_CFLAGS = $(SSE2_EXTRA_CFLAGS)