[Bug #21779] Do not export InitVM functions

Fix ruby/io-console#105.

Author: nobu

configure.ac

@@ -3700,6 +3700,7 @@ AS_CASE("$enable_shared", [yes], [
 	LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-current_version $(RUBY_PROGRAM_VERSION)'
 	AS_IF([test "$visibility_option" = ld], [
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_Init_*'
+	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_InitVM_*'
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_ruby_static_id_*'
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,*_threadptr_*'
 	])

template/Makefile.in

@@ -339,7 +339,8 @@ $(LIBRUBY_SO):
 		@-[ -n "$(EXTSTATIC)" ] || $(PRE_LIBRUBY_UPDATE)
 		$(ECHO) linking shared-library $@
 		$(Q) $(LDSHARED) $(DLDFLAGS) $(OBJS) $(DLDOBJS) $(SOLIBS) $(EXTSOLIBS) $(OUTFLAG)$@
-		-$(Q) $(OBJCOPY) -w -L '$(SYMBOL_PREFIX)Init_*' -L '$(SYMBOL_PREFIX)ruby_static_id_*' \
+		-$(Q) $(OBJCOPY) -w -L '$(SYMBOL_PREFIX)Init_*' -L '$(SYMBOL_PREFIX)InitVM_*' \
+			-L '$(SYMBOL_PREFIX)ruby_static_id_*' \
 			-L '$(SYMBOL_PREFIX)*_threadptr_*' -L '$(SYMBOL_PREFIX)*_ec_*' $@
 		$(Q) $(POSTLINK)
 		@-$(MINIRUBY) -e 'so, *aliases = ARGV; aliases.uniq!; aliases.delete(File.basename(so)); \