Add the missing include of termios.h

The include unlocks the usage of the TIOCNOTTY constant.

Fixes: QTBUG-124642
Change-Id: Ife2475626ca61efe38ea7928a9b61a8aded1701d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qprocess_unix.cpp

@@ -37,6 +37,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/resource.h>
+#include <termios.h>
 #include <unistd.h>
 
 #if __has_include(<paths.h>)