Remove manual tweak of gdextension_interface.h from CI

Remnant from times where the header regularly had breaking changes. Since Godot 4.1,
changes should generally be backwards compatible. Some patching still happens in Rust
code, with direct String::replace() calls.

Author: Bromeon

.github/composite/godot-itest/action.yml

@@ -162,34 +162,6 @@ runs:
         fi
       shell: bash
 
-    # This step no longer fails if there's a diff, as we expect header to be forward-compatible; instead issues a warning
-    # However, still fails if patch cannot be applied (conflict).
-    # Step is only run in latest, not for compat 4.0.1 etc. -> no need to take into account different header versions.
-    - name: "Copy and compare GDExtension header"
-      if: inputs.godot-check-header == 'true'
-      run: |
-        mv godot-ffi/src/gen/gdextension_interface.h godot-ffi/src/gen/gdextension_interface_prebuilt.h
-        mv $RUNNER_DIR/godot_bin/gdextension_interface.h godot-ffi/src/gen/gdextension_interface.h
-        git apply godot-bindings/res/tweak.patch
-        cd godot-ffi/src/gen
-        git diff --no-index --exit-code --quiet gdextension_interface_prebuilt.h gdextension_interface.h || {
-            echo "OUTCOME=header-diff" >> $GITHUB_ENV
-            echo "::warning::gdextension_interface.h is not up-to-date."
-            echo ""
-        
-            echo "### :warning: Outdated GDExtension API header" >> $GITHUB_STEP_SUMMARY
-            echo "gdextension_interface.h contains the following differences:" >> $GITHUB_STEP_SUMMARY
-            echo "\`\`\`diff" >> $GITHUB_STEP_SUMMARY
-            git diff --no-index gdextension_interface_prebuilt.h gdextension_interface.h >> $GITHUB_STEP_SUMMARY || true
-            echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
-            echo "After manually updating file, run:   \`git diff -R > tweak2.patch && mv tweak2.patch tweak.patch\`." >> $GITHUB_STEP_SUMMARY
-
-            # Undo modifications
-            mv gdextension_interface_prebuilt.h gdextension_interface.h
-        	#exit 1
-        }
-      shell: bash
-
     - name: "Run Godot integration tests"
       # Aborts immediately if Godot outputs certain keywords (would otherwise stall until CI runner times out).
       # Explanation:

godot-bindings/res/tweak.patch

@@ -16,8 +16,7 @@ fn main() {
     // struggle with static analysis when symbols are outside the crate directory (April 2023).
     let gen_path = Path::new(concat!(env!("CARGO_MANIFEST_DIR"), "/src/gen"));
 
-    // C header is not strictly required, however it is generated for debugging, and to allow CI
-    // to check for differences (tweak.patch).
+    // C header is not strictly required, however it is generated for debugging.
     let h_path = gen_path.join("gdextension_interface.h");
     let rs_path = gen_path.join("gdextension_interface.rs");