Exclude hsm.go from all standalone builds (#154)

For standalone builds the HSM code is not used, so we can exclude it.
The resulting binary now no longer requires libc of a certain version to
be present.

Makefile

@@ -22,7 +22,8 @@ endif
 # Build
 #########################################
 
-LDFLAGS := -ldflags='-w -X "main.standaloneVersion=$(VERSION)" -extldflags "-static"'
+LDFLAGS := -ldflags='-w -X "main.standaloneVersion=$(VERSION)" -extldflags "-static"' \
+	-tags standalone
 
 download:
 	$Q cd gui; \

gui/hsm.go

@@ -1,4 +1,4 @@
-//go:build amd64
+//go:build !standalone
 
 package main
 

gui/hsm_standalone.go

@@ -1,4 +1,4 @@
-//go:build arm64
+//go:build standalone
 
 package main