Fix .qmail parsing bug

qmail-local handled incorrectly when the first line of a .qmail file
started with whitespace.

[Description by Ismael Luceno <ismael@iodev.co.uk>]
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Import qmail-ldap 19990501
Import qmail-ldap 19990525
Import qmail-ldap 19990805
Import qmail-ldap 19991007
Import qmail-ldap 20000301-preview
Import qmail-ldap 20000325
Import qmail-ldap 20000401
Import qmail-ldap 20000501
Import qmail-ldap 20000601
Import qmail-ldap 20000701
Import qmail-ldap 20001201
Import qmail-ldap 20010101
Import qmail-ldap 20010201
Import qmail-ldap 20010301
Import qmail-ldap 20010501
Import qmail-ldap 20011001a