New build warnings for pmwebapi?

[Ken McDonell <kenj@xxxxxxxxxxxxxxxx>]

It would be good if someone could check these out ... my goal remains no 
compilation warnings on _any_ platform.

main.c:272:67: warning: comparison between signed and unsigned integer 
expressions [-Wsign-compare]
pmwebapi.c: In function ‘pmwebapi_gc’:
pmwebapi.c:96:44: warning: signed and unsigned type in conditional expression 
[-Wsign-compare]
pmwebapi.c: In function ‘pmwebapi_respond_new_context’:
pmwebapi.c:260:60: warning: comparison between signed and unsigned integer 
expressions [-Wsign-compare]


(I don't have better context for the main.c one ... but it is most likely in a 
recently added/changed file)