Generate GNU compatible build-id for mockkms golang binary (#7389)

* Generate GNU compatible build-id for mockkms golang binary

Description

 diff-1: Fix compilation issue

Generate GNU compatible build-id for mockkms golang binary
Leverage "cgo" to generate build-id

Testing

Debian package build, verified the GNU build-id

contrib/mockkms/mock_kms.go

@@ -24,6 +24,15 @@
 
 package main
 
+// Importing module enable .note.gnu.build-id insertion in the ELF executable.
+// Few drawbacks of the scheme are:
+// 1. Potentialy slower builds
+// 2. No cross-compilation support
+// 3. Limited `go tools` availability.
+// TODO: Replace with a better scheme if possible.
+
+import "C"
+
 import (
     "log"
     "math/rand"