Bundle Universal CRT libraries when creating NVDA distribution. (#10347)

This makes it again possible to use NVDA on clean installs of Windows versions older than Windows 10.
Fixes #10031

sconstruct

@@ -19,6 +19,7 @@ from glob import glob
 import sourceEnv
 from py2exe.dllfinder import pydll
 import importlib.util
+import winreg
 
 def recursiveCopy(env,targetDir,sourceDir):
 	targets=[]
@@ -279,6 +280,19 @@ def NVDADistGenerator(target, source, env, for_signature):
 	# Therefore, copy a fresh version  of the dll one more time once py2exe has completed.
 	action.append(Copy(target[0],pydll))
 
+	# #10031: Apps written in Python 3 require Universal CRT to be installed. We cannot assume users have it on their systems.
+	# Therefore , copy required libraries from Windows 10 SDK.
+	try:
+		with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r'SOFTWARE\Microsoft\Microsoft SDKs\Windows\v10.0', 0,winreg.KEY_READ|winreg.KEY_WOW64_32KEY) as SDKKey:
+			CRTDir = os.path.join(winreg.QueryValueEx(SDKKey, 'InstallationFolder')[0], "Redist", "ucrt", "DLLs", "x86")
+	except WindowsError:
+		raise RuntimeError("Windows 10 SDK not found")
+	if os.path.isdir(CRTDir):
+		with os.scandir(CRTDir) as dir:
+			for file in dir:
+				if file.name.endswith(".dll") and file.is_file():
+					action.append(Copy(target[0], file.path))
+
 	if certFile:
 		for prog in "nvda_noUIAccess.exe", "nvda_uiAccess.exe", "nvda_slave.exe", "nvda_eoaProxy.exe":
 			action.append(lambda target,source,env, progByVal=prog: signExec([target[0].File(progByVal)],source,env))