Add copyright header to legacy.c
Add copyright header to legacy.c

Change-Id: I14d901112b810dfad1764188d0d01cf50293ba9c
Reviewed-on: http://review.couchbase.org/44293
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

avsej/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,mnunberg/libcouchbase,mody/libcouchbase,PureSwift/libcouchbase,kojiromike/libcouchbase,PureSwift/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,senthilkumaranb/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase,senthilkumaranb/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,senthilkumaranb/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase