chore: patch gn/find_msvc.py esy/gn_find_msvc.py.patch

esy/build.sh

@@ -21,6 +21,7 @@ ln -s third_party/externals/gyp tools/gyp
 if [[ $OS == "windows" ]]
 then
     WINDOWS_PYTHON_PATH="$(cygpath -w $(which $PYTHON_BINARY))"
+    patch gn/find_msvc.py esy/gn_find_msvc.py.patch
     bin/gn gen $cur__target_dir/out/Shared --script-executable="$WINDOWS_PYTHON_PATH" --args='is_debug=false is_component_build=true' || exit -1
     ninja.exe -C $cur__target_dir/out/Shared
     mv $cur__target_dir/out/Shared/libskia.dll $cur__target_dir/out/Shared/skia.dll # TODO this might not be required once we merge upstream

esy/gn_find_msvc.py.patch

@@ -0,0 +1,11 @@
+--- gn/find_msvc.py	2020-05-02 22:36:22.327109535 +0200
++++ gn/find_msvc.py_new	2020-05-02 22:37:19.234516915 +0200
+@@ -11,7 +11,7 @@
+     C:\\Program Files (x86)\\Microsoft Visual Studio\\${RELEASE}\\${VERSION}\\VC
+ '''
+ def find_msvc():
+-  if sys.platform.startswith('win'):
++  if sys.platform.startswith('win') or "cygwin" in sys.platform:
+     default_dir = r'C:\Program Files (x86)\Microsoft Visual Studio'
+     for release in ['2019', '2017']:
+       for version in ['Enterprise', 'Professional', 'Community', 'BuildTools']: