Make fails on systems with GREP_OPTIONS

In rules/manual-package-config.mk the following use of grep will cause later errors if -n (prepending line numbers) is set in GREP_OPTIONS.

grep -v '^#pragma GCC' $$@.raw | \
	    sed -e 's/""//g' -e 's/:[ 	]*,/: /g' >$$@

It causes parsing issues later, with errors like:

: Warning: Unrecognized field 420 on line 420
: Warning: Unrecognized field 419 on line 419
...
: Warning: Unrecognized field 1 on line 1
: missing id field
: invalid package identifier:
: invalid package key:

It may be worth adding an export GREP_OPTIONS= somewhere in the make file as it's reasonably difficult to figure out the actual problem from the error message. I would do this and submit a patch but I'm not sure if it is desired since GREP_OPTIONS is now deprecated.

Trac metadata

Trac field	Value
Version	7.10.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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