libgsmhr: make use of unused LIBVERSION variable

Change-Id: I4ef723bdd255fb81393806fdc500dacde2dd917f
diff --git a/libgsmhr/Makefile.am b/libgsmhr/Makefile.am
index f36d759..9904098 100644
--- a/libgsmhr/Makefile.am
+++ b/libgsmhr/Makefile.am
@@ -1,3 +1,8 @@
+# This is _NOT_ the library release version, it's an API version.
+# Please read Chapter 6 "Library interface versions" of the libtool
+# documentation before making any modification
+LIBVERSION = 0:0:0
+
 AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
 AM_CFLAGS = -fPIC -Wall ${SYMBOL_VISIBILITY}
 
@@ -6,8 +11,6 @@
 	patches \
 	$(NULL)
 
-LIBVERSION=0:0:0
-
 REFSRC_PATH=refsrc
 REFSRC_SRC=refsrc/dtx.c refsrc/globdefs.c refsrc/host.c refsrc/sp_enc.c refsrc/sp_rom.c refsrc/vad.c refsrc/err_conc.c refsrc/homing.c refsrc/mathdp31.c refsrc/sp_dec.c refsrc/sp_frm.c refsrc/sp_sfrm.c
 
@@ -22,6 +25,7 @@
 
 lib_LTLIBRARIES = libgsmhr.la
 libgsmhr_la_SOURCES = $(REFSRC_SRC) libgsmhr.c
+libgsmhr_la_LDFLAGS = -version-info $(LIBVERSION)
 libgsmhr_la_LIBADD = -ldl
 
 clean-local: