documentation for the macro "user_access"

Checks if the needed users are considered in the policy

It is defined in the file build.m4.

m4 code:

define(`user_access',
`define(`_policy_makefile_increments',`
check_user_access:` policy.conf'`'`
patsubst(`grep gpl_users policy.conf',^,
`	')'
'_policy_makefile_increments)dnl
define(`_policy_tests',_policy_tests`\
		check_user_access')')