Remove some deprecated glib2 function calls #51

Here is the warning I get:

/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:420:13: warning: 'gboolean g_thread_get_initialized()' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:265) [-Wdeprecated-declarations]
       if( ! g_thread_get_initialized () ) {
             ^
/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:420:39: warning: 'gboolean g_thread_get_initialized()' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:265) [-Wdeprecated-declarations]
       if( ! g_thread_get_initialized () ) {
                                       ^
/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:421:9: warning: 'void g_thread_init(gpointer)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:260) [-Wdeprecated-declarations]
         g_thread_init(NULL);
         ^
/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:421:27: warning: 'void g_thread_init(gpointer)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:260) [-Wdeprecated-declarations]
         g_thread_init(NULL);
                           ^
/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:425:35: warning: 'GThread* g_thread_create(GThreadFunc, gpointer, gboolean, GError**)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:100): Use 'g_thread_new' instead [-Wdeprecated-declarations]
     GThread* glib_thread_handle = g_thread_create((GThreadFunc)TQThreadInstance::start, d->args, false, NULL);
                                   ^
/home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:425:109: warning: 'GThread* g_thread_create(GThreadFunc, gpointer, gboolean, GError**)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:100): Use 'g_thread_new' instead [-Wdeprecated-declarations]
     GThread* glib_thread_handle = g_thread_create((GThreadFunc)TQThreadInstance::start, d->args, false, NULL);

For reference:
https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-thread-get-initialized
https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-thread-init
https://developer.gnome.org/glib/stable/glib-Threads.html#g-thread-new

Here is the warning I get: ``` /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:420:13: warning: 'gboolean g_thread_get_initialized()' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:265) [-Wdeprecated-declarations] if( ! g_thread_get_initialized () ) { ^ /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:420:39: warning: 'gboolean g_thread_get_initialized()' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:265) [-Wdeprecated-declarations] if( ! g_thread_get_initialized () ) { ^ /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:421:9: warning: 'void g_thread_init(gpointer)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:260) [-Wdeprecated-declarations] g_thread_init(NULL); ^ /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:421:27: warning: 'void g_thread_init(gpointer)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:260) [-Wdeprecated-declarations] g_thread_init(NULL); ^ /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:425:35: warning: 'GThread* g_thread_create(GThreadFunc, gpointer, gboolean, GError**)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:100): Use 'g_thread_new' instead [-Wdeprecated-declarations] GThread* glib_thread_handle = g_thread_create((GThreadFunc)TQThreadInstance::start, d->args, false, NULL); ^ /home/cethyel/CMAKE_CONVERSION/tqt3/src/kernel/qthread_unix.cpp:425:109: warning: 'GThread* g_thread_create(GThreadFunc, gpointer, gboolean, GError**)' is deprecated (declared at /usr/include/glib-2.0/glib/deprecated/gthread.h:100): Use 'g_thread_new' instead [-Wdeprecated-declarations] GThread* glib_thread_handle = g_thread_create((GThreadFunc)TQThreadInstance::start, d->args, false, NULL); ``` For reference: https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-thread-get-initialized https://developer.gnome.org/glib/stable/glib-Deprecated-Thread-APIs.html#g-thread-init https://developer.gnome.org/glib/stable/glib-Threads.html#g-thread-new

Looks good to me. Any specific reason why this is marked WIP?