fix(xcode): 12.3 support (#92)

Author: NathanWalker

project-template/internal/nativescript-build.xcconfig

@@ -21,4 +21,5 @@ LDPLUSPLUS = $SRCROOT/internal/nsld.sh
 // Xcode 12 
 EXCLUDED_ARCHS_x86_64 = arm64 arm64e
 EXCLUDED_ARCHS[sdk=iphonesimulator*] = i386 armv6 armv7 armv7s armv8 $(EXCLUDED_ARCHS_$(NATIVE_ARCH_64_BIT))
-EXCLUDED_ARCHS[sdk=iphoneos*] = i386 armv6 armv7 armv7s armv8 x86_64
+EXCLUDED_ARCHS[sdk=iphoneos*] = i386 armv6 armv7 armv7s armv8 x86_64
+VALIDATE_WORKSPACE = YES