Merge branch 'wip/hadess/more-string-h' into 'master'

lib: Include more standard headers for drivers to use

See merge request libfprint/libfprint!8

libfprint/drivers_api.h

@@ -30,6 +30,8 @@
 
 #include <stdint.h>
 #include <errno.h>
+#include <string.h>
+#include <stdlib.h>
 #include <glib.h>
 #include <libusb.h>