remove AC_DISABLE_STATIC again

why did I add this? with deebe76 when updating to autoconf 2.71
it breaks macOS builds. and static progs are fine for me, even if huge.
we still should support --en/disable-shared and --en/disable-static.

fix macos gh actions deps

.github/workflows/main.yml

@@ -164,7 +164,7 @@ jobs:
     runs-on: macOS-latest
     steps:
     - name: init
-      run: brew install automake texinfo
+      run: brew install autoconf automake libtool texinfo 
     - name: link texinfo
       run: brew link texinfo --force
     - name: setup-python

configure.ac

@@ -19,7 +19,7 @@ dnl AM_INIT_AUTOMAKE([1.11.6 gnu no-define])
 dnl parallel-tests:
 dnl: error: using '$(srcdir)' in TESTS is currently broken: '$(srcdir)/libredwg.spec'
 AM_INIT_AUTOMAKE([1.14 gnu no-define serial-tests dist-xz info-in-builddir])
-AC_DISABLE_STATIC
+LT_INIT
 
 # Keep this in sync with what is passed in AC_INIT
 TARBALL_VERSION_FILE=".tarball-version"
@@ -56,7 +56,6 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
 AC_PROG_EGREP
-LT_INIT
 AC_CHECK_PROGS([BASH], [bash])
 
 if test x$enable_shared = xyes; then