QNX: fix slog2 for QNX7

Change the include header to sys/slog2.h, which is available
in both QNX 6.6.0 and 7.

Task-number: QTBUG-64033
Change-Id: I26d8c5451376bab33e11f4784ca772f84cd6fc28
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/configure.json

@@ -178,7 +178,7 @@
         "slog2": {
             "label": "slog2",
             "test": {
-                "include": "slog2.h",
+                "include": "sys/slog2.h",
                 "main": "slog2_set_default_buffer((slog2_buffer_t)-1);"
             },
             "export": "",

src/corelib/global/qlogging.cpp

@@ -61,7 +61,7 @@
 #include <qt_windows.h>
 #endif
 #if QT_CONFIG(slog2)
-#include <slog2.h>
+#include <sys/slog2.h>
 #endif
 
 #ifdef Q_OS_ANDROID