BuildSystem: Detect external library Lua in version 5.3.

On some platforms, you decide to go for one specific version of Lua, for
example in OpenBSD. On other platforms, you are able to install several versions
side-by-side, for example in Ubuntu and Fedora. Asterisk already works with
Lua 5.3. Asterisk failed to detect Lua 5.3 on those platforms which allow
several versions.

ASTERISK-27592

Change-Id: If7a4b395d844a464e9a1f4f626c5bff4ee67eed8

configure

@@ -30249,6 +30249,110 @@ $as_echo "#define HAVE_OPENH323 1" >>confdefs.h
 fi
+if test "x${PBX_LUA}" != "x1" -a "${USE_LUA}" != "no"; then
+   pbxlibdir=""
+   # if --with-LUA=DIR has been specified, use it.
+   if test "x${LUA_DIR}" != "x"; then
+      if test -d ${LUA_DIR}/lib; then
+         pbxlibdir="-L${LUA_DIR}/lib"
+      else
+         pbxlibdir="-L${LUA_DIR}"
+      fi
+   fi
+
+      ast_ext_lib_check_save_CFLAGS="${CFLAGS}"
+      CFLAGS="${CFLAGS} "
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for luaL_newstate in -llua5.3" >&5
+$as_echo_n "checking for luaL_newstate in -llua5.3... " >&6; }
+if ${ac_cv_lib_lua5_3_luaL_newstate+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-llua5.3 ${pbxlibdir} -lm $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char luaL_newstate ();
+int
+main ()
+{
+return luaL_newstate ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_lua5_3_luaL_newstate=yes
+else
+  ac_cv_lib_lua5_3_luaL_newstate=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_lua5_3_luaL_newstate" >&5
+$as_echo "$ac_cv_lib_lua5_3_luaL_newstate" >&6; }
+if test "x$ac_cv_lib_lua5_3_luaL_newstate" = xyes; then :
+  AST_LUA_FOUND=yes
+else
+  AST_LUA_FOUND=no
+fi
+
+      CFLAGS="${ast_ext_lib_check_save_CFLAGS}"
+
+
+   # now check for the header.
+   if test "${AST_LUA_FOUND}" = "yes"; then
+      LUA_LIB="${pbxlibdir} -llua5.3 -lm"
+      # if --with-LUA=DIR has been specified, use it.
+      if test "x${LUA_DIR}" != "x"; then
+         LUA_INCLUDE="-I${LUA_DIR}/include"
+      fi
+      LUA_INCLUDE="${LUA_INCLUDE} "
+
+         # check for the header
+         ast_ext_lib_check_saved_CPPFLAGS="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${LUA_INCLUDE}"
+         ac_fn_c_check_header_mongrel "$LINENO" "lua5.3/lua.h" "ac_cv_header_lua5_3_lua_h" "$ac_includes_default"
+if test "x$ac_cv_header_lua5_3_lua_h" = xyes; then :
+  LUA_HEADER_FOUND=1
+else
+  LUA_HEADER_FOUND=0
+fi
+
+
+         CPPFLAGS="${ast_ext_lib_check_saved_CPPFLAGS}"
+
+      if test "x${LUA_HEADER_FOUND}" = "x0" ; then
+         LUA_LIB=""
+         LUA_INCLUDE=""
+      else
+
+         PBX_LUA=1
+         cat >>confdefs.h <<_ACEOF
+#define HAVE_LUA 1
+_ACEOF
+
+      fi
+   fi
+fi
+
+
+if test "x${PBX_LUA}" = "x1" ; then
+	if test x"${LUA_DIR}" = x; then
+		LUA_INCLUDE="${LUA_INCLUDE} -I/usr/include/lua5.3"
+	else
+		LUA_INCLUDE="${LUA_INCLUDE} -I${LUA_DIR}/lua5.3"
+	fi
+fi
+
+
 if test "x${PBX_LUA}" != "x1" -a "${USE_LUA}" != "no"; then
    pbxlibdir=""
    # if --with-LUA=DIR has been specified, use it.

configure.ac

@@ -2409,6 +2409,15 @@ if test "${PBX_PWLIB}" = "1" -a "${USE_OPENH323}" != "no" ; then
 		[${PWLIB_INCLUDE}], [${PWLIB_LIB}])
 fi
 
+AST_EXT_LIB_CHECK([LUA], [lua5.3], [luaL_newstate], [lua5.3/lua.h], [-lm])
+if test "x${PBX_LUA}" = "x1" ; then
+	if test x"${LUA_DIR}" = x; then
+		LUA_INCLUDE="${LUA_INCLUDE} -I/usr/include/lua5.3"
+	else
+		LUA_INCLUDE="${LUA_INCLUDE} -I${LUA_DIR}/lua5.3"
+	fi
+fi
+
 AST_EXT_LIB_CHECK([LUA], [lua5.2], [luaL_newstate], [lua5.2/lua.h], [-lm])
 if test "x${PBX_LUA}" = "x1" ; then
 	if test x"${LUA_DIR}" = x; then