Avoids needing xcrun or xcodebuild in PATH for native package builds

--- a/tools/gyp/pylib/gyp/xcode_emulation.py
+++ b/tools/gyp/pylib/gyp/xcode_emulation.py
@@ -522,7 +522,13 @@ class XcodeSettings:
         # Since the CLT has no SDK paths anyway, returning None is the
         # most sensible route and should still do the right thing.
         try:
-            return GetStdoutQuiet(["xcrun", "--sdk", sdk, infoitem])
+            #return GetStdoutQuiet(["xcrun", "--sdk", sdk, infoitem])
+            return {
+                "--show-sdk-platform-path": "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform",
+                "--show-sdk-path": "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk",
+                "--show-sdk-build-version": "19A547",
+                "--show-sdk-version": "10.15"
+            }[infoitem]
         except GypError:
             pass
 
@@ -1499,7 +1505,8 @@ def XcodeVersion():
     version = ""
     build = ""
     try:
-        version_list = GetStdoutQuiet(["xcodebuild", "-version"]).splitlines()
+        #version_list = GetStdoutQuiet(["xcodebuild", "-version"]).splitlines()
+        version_list = []
         # In some circumstances xcodebuild exits 0 but doesn't return
         # the right results; for example, a user on 10.7 or 10.8 with
         # a bogus path set via xcode-select
@@ -1510,7 +1517,8 @@ def XcodeVersion():
         version = version_list[0].split()[-1]  # Last word on first line
         build = version_list[-1].split()[-1]  # Last word on last line
     except GypError:  # Xcode not installed so look for XCode Command Line Tools
-        version = CLTVersion()  # macOS Catalina returns 11.0.0.0.1.1567737322
+        #version = CLTVersion()  # macOS Catalina returns 11.0.0.0.1.1567737322
+        version = "11.0.0.0.1.1567737322"
         if not version:
             raise GypError("No Xcode or CLT version detected!")
     # Be careful to convert "4.2.3" to "0423" and "11.0.0" to "1100":
--- a/deps/npm/node_modules/node-gyp/gyp/pylib/gyp/xcode_emulation.py
+++ b/deps/npm/node_modules/node-gyp/gyp/pylib/gyp/xcode_emulation.py
@@ -522,7 +522,13 @@ class XcodeSettings:
         # Since the CLT has no SDK paths anyway, returning None is the
         # most sensible route and should still do the right thing.
         try:
-            return GetStdoutQuiet(["xcrun", "--sdk", sdk, infoitem])
+            #return GetStdoutQuiet(["xcrun", "--sdk", sdk, infoitem])
+            return {
+                "--show-sdk-platform-path": "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform",
+                "--show-sdk-path": "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk",
+                "--show-sdk-build-version": "19A547",
+                "--show-sdk-version": "10.15"
+            }[infoitem]
         except GypError:
             pass
 
@@ -1499,7 +1505,8 @@ def XcodeVersion():
     version = ""
     build = ""
     try:
-        version_list = GetStdoutQuiet(["xcodebuild", "-version"]).splitlines()
+        #version_list = GetStdoutQuiet(["xcodebuild", "-version"]).splitlines()
+        version_list = []
         # In some circumstances xcodebuild exits 0 but doesn't return
         # the right results; for example, a user on 10.7 or 10.8 with
         # a bogus path set via xcode-select
@@ -1510,7 +1517,8 @@ def XcodeVersion():
         version = version_list[0].split()[-1]  # Last word on first line
         build = version_list[-1].split()[-1]  # Last word on last line
     except GypError:  # Xcode not installed so look for XCode Command Line Tools
-        version = CLTVersion()  # macOS Catalina returns 11.0.0.0.1.1567737322
+        #version = CLTVersion()  # macOS Catalina returns 11.0.0.0.1.1567737322
+        version = "11.0.0.0.1.1567737322"
         if not version:
             raise GypError("No Xcode or CLT version detected!")
     # Be careful to convert "4.2.3" to "0423" and "11.0.0" to "1100":