added reference

Author: Skycoder42

src/3rdparty/cryptopp/cryptopp.pro

@@ -9,6 +9,7 @@ win32:!win32-g++ {
 	MODULE_DEFINES += CRYPTOPP_DISABLE_ASM #TODO reenable again later
 	cross_compile: MODULE_DEFINES += NO_OS_DEPENDENCE
 } else {
+        # based on https://github.com/KayEss/fost-crypto/blob/master/CMakeLists.txt
 	QMAKE_CXXFLAGS += -Wno-keyword-macro -Wno-unused-const-variable -Wno-unused-private-field
 
 	!isEmpty(ANDROID_TARGET_ARCH) {