documentation for the macro "unwanted_newlines"

Checks for unwanted newlines propagated to the output

It is defined in the file build.m4.

m4 code:

define(`unwanted_newlines',
`define(`_policy_makefile_increments',`
check_unwanted_newlines:` bootstrap'`'`
patsubst(`head -n1 bootstrap | grep -v ^$$',^,
`	')'
'_policy_makefile_increments)dnl
define(`_policy_tests',_policy_tests`\
		check_unwanted_newlines')')