Fix build runner (#1029)

* Fix build runner

* Add zls module, bump version

* Fix path from root issue in modules (thanks daremakemyday from Twitch :))

* Libraryify

* remove build_runner backward compatibility

* Remove some `= undefined`s in Server.zig

Makes library use less dangerous

* Consistent mem model + custom build runner possible

* Add build runner utils for third-party tooling

* Make logs removable in libraries with zls_ prefix

* Fix build runner CI

* Expose references

* Use new addModule

.github/workflows/build_runner.yml

@@ -17,7 +17,7 @@ jobs:
   check_build_runner:
     strategy:
       matrix:
-        zig_version: [0.9.1, 0.10.1, master]
+        zig_version: [master]
 
     runs-on: ubuntu-latest
 
@@ -33,16 +33,7 @@ jobs:
         with:
           version: ${{ matrix.zig_version }}
 
-      - name: Create temp zig project
-        run: |
-          mkdir $RUNNER_TEMP/TEMP_ZIG_PROJECT
-          cd $RUNNER_TEMP/TEMP_ZIG_PROJECT
-          zig init-exe
-
       - name: Check build_runner builds on master
-        if: ${{ matrix.zig_version == 'master' }}
-        run: zig build-exe $GITHUB_WORKSPACE/src/special/build_runner.zig --mod @build@::$RUNNER_TEMP/TEMP_ZIG_PROJECT/build.zig --deps @build@
-
-      - name: Check build_runner builds on older tagged releases
-        if: ${{ matrix.zig_version != 'master' }}
-        run: zig build-exe $GITHUB_WORKSPACE/src/special/build_runner.zig --pkg-begin @build@ $RUNNER_TEMP/TEMP_ZIG_PROJECT/build.zig --pkg-end
+        run: |
+          pwd
+          zig build --build-runner src/special/build_runner.zig