Fix module log ids for all of mod_fastcgi.  With the previous
patch, the module id ("fastcgi") was only available for messages
logged from mod_fastcgi.c.  For messages logged from other files,
the id would be unavailable for logging *and* module-specific
log levels would not take affect.

Part of the original patch has been removed -- the use of
AP_DECLARE_MODULE(fastcgi) -- because it wasn't sufficient for
providing a module id when logging from source files other than
that one, and it interfered with the real fix (APLOG_USE_MODULE).