BSD makefile fix for OpenBSD.

make-bsd.mk

@@ -122,7 +122,7 @@ ifeq ($(ZT_USE_ARM32_NEON_ASM_SALSA2012),1)
 	override OBJS+=ext/arm32-neon-salsa2012-asm/salsa2012.o
 endif
 
-DEFS+=-DZT_BUILD_PLATFORM=$(ZT_BUILD_PLATFORM) -DZT_BUILD_ARCHITECTURE=$(ZT_ARCHITECTURE) -DZT_SOFTWARE_UPDATE_DEFAULT="\"disable\""
+override DEFS+=-DZT_BUILD_PLATFORM=$(ZT_BUILD_PLATFORM) -DZT_BUILD_ARCHITECTURE=$(ZT_ARCHITECTURE) -DZT_SOFTWARE_UPDATE_DEFAULT="\"disable\""
 
 CXXFLAGS+=$(CFLAGS) -fno-rtti -std=c++11 #-D_GLIBCXX_USE_C99 -D_GLIBCXX_USE_C99_MATH -D_GLIBCXX_USE_C99_MATH_TR1