libs/vkd3d: Set names for internal threads.

Signed-off-by: Józef Kucia <jkucia@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

m4/check-functions.m4

@@ -7,3 +7,10 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return [$3]; }])],
                          [1],
                          [Define to 1 if you have $2.])],
                [AC_MSG_RESULT([no])])])
+
+dnl VKD3D_CHECK_LIB_FUNCS
+AC_DEFUN([VKD3D_CHECK_LIB_FUNCS],
+[vkd3d_libs_saved="$LIBS"
+LIBS="$LIBS $2"
+AC_CHECK_FUNCS([$1], [$3], [$4])
+LIBS="$vkd3d_libs_saved"])