Hack to disable shared library detection, so configure won't try
to link with "/usr/local/lib/libiconv.so -static".

--- configure.orig	2021-01-07 14:30:44 UTC
+++ configure
@@ -40537,7 +40537,7 @@ fi
 $as_echo "$acl_cv_rpath" >&6; }
   wl="$acl_cv_wl"
   acl_libext="$acl_cv_libext"
-  acl_shlibext="$acl_cv_shlibext"
+  acl_shlibext="${SHLIBEXT-$acl_cv_shlibext}"
   acl_libname_spec="$acl_cv_libname_spec"
   acl_library_names_spec="$acl_cv_library_names_spec"
   acl_hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec"