patch 9.0.1433: on some systems the Lua library is not found

Problem:    On some systems the Lua library is not found.
Solution:   Check if a subdirectory for Lua exists.  (closes #4475)
diff --git a/src/configure.ac b/src/configure.ac
index 13f5700..94e1863 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -716,11 +716,17 @@
 	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${lib_multiarch} -lluajit-$vi_cv_version_lua"
       fi
     else
-      if test "X$LUA_INC" != "X"; then
-	dnl Test alternate location using version
-	LUA_LIBS="-L${vi_cv_path_lua_pfx}/lib -llua$vi_cv_version_lua"
+      dnl Test alternate lib location including version
+      if test -d "${vi_cv_path_lua_pfx}/lib/lua$vi_cv_version_lua"; then
+	LUALIBDIR="lib/lua$vi_cv_version_lua"
       else
-	LUA_LIBS="-L${vi_cv_path_lua_pfx}/lib -llua"
+	LUALIBDIR=lib
+      fi
+      if test "X$LUA_INC" != "X"; then
+	dnl Test alternate name including version
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${LUALIBDIR} -llua$vi_cv_version_lua"
+      else
+	LUA_LIBS="-L${vi_cv_path_lua_pfx}/${LUALIBDIR} -llua"
       fi
     fi
     if test "$enable_luainterp" = "dynamic"; then