Fix the OSTC4 firmware upgrade

In commit 1c8cd096b57a876c4fb0afc5113aac05d75d924e the block size was
changed from 64 to 1024 bytes. For bluetooth classic communication, this
shouldn't matter, but for some reason it does cause the OSTC4 firmware
upgrade to fail. Maybe some buffering problem in the OSTC4 firmware or
bluetooth stack?

Change the block size back to 64 bytes.

configure.ac

@@ -1,8 +1,8 @@
 # Versioning.
 m4_define([dc_version_major],[0])
 m4_define([dc_version_minor],[8])
-m4_define([dc_version_micro],[0])
-m4_define([dc_version_suffix],[])
+m4_define([dc_version_micro],[1])
+m4_define([dc_version_suffix],[devel])
 m4_define([dc_version],dc_version_major.dc_version_minor.dc_version_micro[]m4_ifset([dc_version_suffix],-[dc_version_suffix]))
 
 # Libtool versioning.

src/hw_ostc3.c

@@ -240,7 +240,7 @@ hw_ostc3_write (hw_ostc3_device_t *device, dc_event_progress_t *progress, const
 	size_t nbytes = 0;
 	while (nbytes < size) {
 		// Set the maximum packet size.
-		size_t length = 1024;
+		size_t length = (device->hardware == OSTC4) ? 64 : 1024;
 
 		// Limit the packet size to the total size.
 		if (nbytes + length > size)