don't build on unsupported platforms

make-linux.mk

@@ -122,6 +122,7 @@ ifeq ($(CC_MACH),x86_64)
 	ZT_USE_X64_ASM_ED25519=1
 	override CFLAGS+=-msse -msse2
 	override CXXFLAGS+=-msse -msse2
+	ZT_SSO_SUPPORTED=1
 endif
 ifeq ($(CC_MACH),amd64)
 	ZT_ARCHITECTURE=2
@@ -129,6 +130,7 @@ ifeq ($(CC_MACH),amd64)
 	ZT_USE_X64_ASM_ED25519=1
 	override CFLAGS+=-msse -msse2
 	override CXXFLAGS+=-msse -msse2
+	ZT_SSO_SUPPORTED=1
 endif
 ifeq ($(CC_MACH),powerpc64le)
 	ZT_ARCHITECTURE=8
@@ -217,10 +219,12 @@ ifeq ($(CC_MACH),armv7ve)
 endif
 ifeq ($(CC_MACH),arm64)
 	ZT_ARCHITECTURE=4
+	ZT_SSO_SUPPORTED=1
 	override DEFS+=-DZT_NO_TYPE_PUNNING -DZT_ARCH_ARM_HAS_NEON -march=armv8-a+crypto -mtune=generic -mstrict-align
 endif
 ifeq ($(CC_MACH),aarch64)
 	ZT_ARCHITECTURE=4
+	ZT_SSO_SUPPORTED=1
 	override DEFS+=-DZT_NO_TYPE_PUNNING -DZT_ARCH_ARM_HAS_NEON -march=armv8-a+crypto -mtune=generic -mstrict-align
 endif
 ifeq ($(CC_MACH),mipsel)
@@ -371,8 +375,12 @@ debug:	FORCE
 	make ZT_DEBUG=1 one
 	make ZT_DEBUG=1 selftest
 
+ifeq ($(ZT_SSO_SUPPORTED), 1)
 zeroidc:	FORCE
 	cd zeroidc && cargo build $(RUSTFLAGS)
+else
+zeroidc:
+endif
 
 # Note: keep the symlinks in /var/lib/zerotier-one to the binaries since these
 # provide backward compatibility with old releases where the binaries actually