Adjust architecture file name used for built library files

[olof-nord]

In order to allow easier pipeline and Makefile usage, rename the library file as to adhere to the architecture output of uname --machine

[nanu-c]

This is missing the imports from cgo:

#cgo linux,amd64 LDFLAGS: -L${SRCDIR}/lib '-Wl,-rpath,$$ORIGIN/' -lzkgroup_linux_amd64
#cgo linux,arm64 LDFLAGS: -L${SRCDIR}/lib '-Wl,-rpath,$$ORIGIN/' -lzkgroup_linux_arm64
#cgo linux,arm LDFLAGS: -L${SRCDIR}/lib '-Wl,-rpath,$$ORIGIN/' -lzkgroup_linux_armhf