QProcess: skip processesInMultipleThreads test on emulators

The test has timed out when run on ARM in qemu. We start more threads
than the ideal count, which is likely too much for the emulator when not
running the native architecture.

Pick-to: 6.4
Change-Id: I42e11945070646551e77c10618df762a4bffc8ba
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/corelib/io/qprocess/test/CMakeLists.txt

@@ -9,6 +9,7 @@ qt_internal_add_test(tst_qprocess
     PUBLIC_LIBRARIES
         Qt::CorePrivate
         Qt::Network
+        Qt::TestPrivate
 )
 
 ## Build assorted sub-programs called from the test:

tests/auto/corelib/io/qprocess/tst_qprocess.cpp

@@ -23,6 +23,8 @@
 #  include <private/qcore_unix_p.h>
 #endif
 
+#include <QtTest/private/qemulationdetector_p.h>
+
 #include <stdlib.h>
 
 typedef void (QProcess::*QProcessErrorSignal)(QProcess::ProcessError);
@@ -1223,6 +1225,9 @@ void tst_QProcess::processInAThread()
 
 void tst_QProcess::processesInMultipleThreads()
 {
+    if (QTestPrivate::isRunningArmOnX86())
+        QSKIP("Test is too slow to run on emulator");
+
 #if defined(Q_OS_QNX)
     QSKIP("QNX: Large amount of threads is unstable and do not finish in given time");
 #endif