Migrated gyp for breakpad to upstream in prepare script on macOS.

Telegram/build/prepare/prepare.py

@@ -82,6 +82,7 @@ environment = {
     'USED_PREFIX': usedPrefix,
     'ROOT_DIR': rootDir,
     'LIBS_DIR': libsDir,
+    'THIRDPARTY_DIR': thirdPartyDir,
     'SPECIAL_TARGET': 'win' if win32 else 'win64' if win64 else 'mac',
     'X8664': 'x86' if win32 else 'x64',
     'WIN32X64': 'Win32' if win32 else 'x64',
@@ -446,8 +447,10 @@ win:
 depends:patches/gyp.diff
     git apply $LIBS_DIR/patches/gyp.diff
 mac:
-    python3 -m pip install --ignore-installed git+https://github.com/desktop-app/gyp-next@main
-    mkdir gyp
+    python3 -m pip install ^
+        --ignore-installed ^
+        --target=$THIRDPARTY_DIR/gyp ^
+        git+https://chromium.googlesource.com/external/gyp@master
 """, 'ThirdParty')
 
 stage('yasm', """
@@ -1033,6 +1036,7 @@ depends:patches/breakpad.diff
     cd src/third_party/lss
     git checkout e1e7b0ad8e
     cd ../../build
+    PYTHONPATH=$THIRDPARTY_DIR/gyp
     python3 gyp_breakpad
     cd ../processor
     xcodebuild -project processor.xcodeproj -target minidump_stackwalk -configuration Release build