wok log re2c/receipt

age author description
2019-09-25 Pascal Bellard sarg: fix build
2019-09-18 Pascal Bellard Fix re2c build
2019-09-14 Hans-G?nter Theisgen re2c: modified WGET_URL
2019-09-14 Hans-G?nter Theisgen updated re2c (0.13.5 -> 1.2.1)
2013-12-05 Pascal Bellard Add some licenses
2010-02-24 Rohit Joshi add/improve TAGS r* receipts
2009-04-29 Christophe Lincoln Add re2c (scanners library)