fix lj_vm.obj and do_file (#311)

Co-authored-by: Zac He <zac.he@zoom.us>

Author: exploman

compile/luajit/make.lua

@@ -145,7 +145,7 @@ lm:executable("luajit/lua") {
         "lj_*.c",
         "lib_*.c",
         "!lj_str_hash.c",
-        "../../../../" .. lm.bindir .. "/lj_vm.obj",
+        lm.bindir .. "/lj_vm.obj",
     },
     includes = {
         ".",

extension/script/debugger.lua

@@ -1,4 +1,13 @@
 local selfsource = ...
+
+if not selfsource then
+    local source = debug.getinfo(1, "S").source
+    if source:sub(1, 1) == "@" then
+        local filepath = source:sub(2)
+        selfsource = filepath
+    end
+end
+
 local root = selfsource
                 :match "(.+)[/][^/]+$"
                 :match "(.+)[/][^/]+$"