Split each USB serial adapter type's support out into its own source file. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8215 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Create a header for each USB serial adapter type. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8216 91a5dbb7-01b9-0310-9b5f-b28072856b6e
probeBrailleDisplay() should also allow ETIMEDOUT. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8217 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Standardize the order async headers and objects are included. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8218 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Clean up some minor issues with the management of async thread-specific data. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8219 91a5dbb7-01b9-0310-9b5f-b28072856b6e
The server threads should run with all real-time signals blocked. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8220 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Remove an unneeded #ifndef and #endif. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8221 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Improve the Posix Threads check. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8222 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Log whether a Linux USB URB is being submitted or was reaped. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8223 91a5dbb7-01b9-0310-9b5f-b28072856b6e