This is to speed up the build and compile all libgc source files into
a single .o file (to enable more compiler optimizations).
* configure.ac (LT_INIT): Pass disable-static; add comment.
AC_PROG_CXX
AM_PROG_AS
AC_PROG_INSTALL
-LT_INIT
+LT_INIT([disable-static])
+# Only the shared libraries are produced by default, use "--enable-static"
+# option to override it.
# Note: If Autoconf reports that LIBTOOL (or AC_ENABLE_SHARED, or
# AC_PROG_LIBTOOL) is undefined, Libtool installation should be checked.