configure: remove unused LIBVLC_ABI_LT_xxx values

configure.ac

@@ -13,10 +13,6 @@ VERSION_DEV=dev
 LIBVLC_ABI_MAJOR=12
 LIBVLC_ABI_MINOR=0
 LIBVLC_ABI_MICRO=0
-# libtool version-info values
-LIBVLC_ABI_LT_CURRENT=`expr $LIBVLC_ABI_MAJOR + $LIBVLC_ABI_MINOR`
-LIBVLC_ABI_LT_REVISION=$LIBVLC_ABI_MICRO
-LIBVLC_ABI_LT_AGE=$LIBVLC_ABI_MINOR
 
 PKGDIR="vlc"
 AC_SUBST([PKGDIR])
@@ -4641,9 +4637,6 @@ AC_SUBST([VERSION_MAJOR])
 AC_SUBST([VERSION_MINOR])
 AC_SUBST([VERSION_REVISION])
 AC_SUBST([VERSION_EXTRA])
-AC_SUBST([LIBVLC_ABI_LT_CURRENT])
-AC_SUBST([LIBVLC_ABI_LT_REVISION])
-AC_SUBST([LIBVLC_ABI_LT_AGE])
 AC_SUBST([LIBVLC_ABI_MAJOR])
 AC_SUBST([LIBVLC_ABI_MINOR])
 AC_SUBST([LIBVLC_ABI_MICRO])