Fixed cryptopp compatibility issues #3

Author: jushar

vendor/cryptopp/GNUmakefile

@@ -42,7 +42,7 @@ ifneq ($(GCC42_OR_LATER),0)
 ifeq ($(UNAME),Darwin)
 CXXFLAGS += -arch x86_64 -arch i386
 else
-CXXFLAGS += -mtune=generic
+CXXFLAGS += -march=k8 -mtune=generic
 endif
 endif