Fix build break for zig 0.14.0-dev.2596

- There's no root_module.addCMacro anymore

- There's also no root_module.unwind_tables boolean anymore.  Setting
  "unwind_tables = .sync" should match earlier behavior.

for #130

.github/workflows/docs.yml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/configure-pages@v2
       - uses: mlugg/setup-zig@v1
         with:
-          version: 0.14.0-dev.1820+ea527f7a8
+          version: 0.14.0-dev.2596+e6879e99e
       - run: make docs
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Setup Zig
       uses: mlugg/setup-zig@v1
       with:
-        version: 0.14.0-dev.1820+ea527f7a8
+        version: 0.14.0-dev.2596+e6879e99e
 
     - name: Run tests
       run: make test

build/luajit.zig

@@ -11,12 +11,14 @@ pub fn configure(b: *Build, target: Build.ResolvedTarget, optimize: std.builtin.
             .name = "lua",
             .target = target,
             .optimize = optimize,
+            .unwind_tables = .sync,
         })
     else
         b.addStaticLibrary(.{
             .name = "lua",
             .target = target,
             .optimize = optimize,
+            .unwind_tables = .sync,
         });
 
     // Compile minilua interpreter used at build time to generate files
@@ -163,9 +165,9 @@ pub fn configure(b: *Build, target: Build.ResolvedTarget, optimize: std.builtin.
 
     lib.linkLibC();
 
-    lib.defineCMacro("LUAJIT_UNWIND_EXTERNAL", null);
+    lib.root_module.addCMacro("LUAJIT_UNWIND_EXTERNAL", "");
+
     lib.linkSystemLibrary("unwind");
-    lib.root_module.unwind_tables = true;
 
     lib.addIncludePath(upstream.path("src"));
     lib.addIncludePath(luajit_h.dirname());