[pkg-fso-maint] Bug#573504: reduction of implicit declarations

[Heiko Stübner]

with the upload of libfsobasics 0.9.0+git20100509 I was able to reduce the 
number of implicit declared functions. From 9 implicit declared functions 
(including the reported one) only 2 are left (vala_library_init and 
vala_library_fini).

With submitting my patches to upstream I also asked about some clarification 
about the last two functions.