fix 'make install_kext' for hid-flasher

* based on https://www.tonymacx86.com/threads/guide-installing-3rd-party-kexts-el-capitan-sierra-high-sierra-mojave-catalina.268964/

Author: pwpiwi

client/hid-flasher/Makefile

@@ -36,6 +36,9 @@ clean:
 
 # must be run as root
 install_kext: Info.plist
+	spctl --master-disable
+	mount -uw
+	killall Finder
 	mkdir -p /System/Library/Extensions/Proxmark3.kext/Contents
 	cp Info.plist /System/Library/Extensions/Proxmark3.kext/Contents
 	chown -R root:wheel /System/Library/Extensions/Proxmark3.kext