QProcess: add testUnixProcessParameters as a dep. for tst_qprocess

So that building only tst_qprocess also builds the required test app.

Change-Id: I19a92f9dd2f4de08302d09cad0caf55c285a6dae
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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

@@ -42,3 +42,7 @@ endif()
 if(WIN32)
     add_dependencies(tst_qprocess testProcessEchoGui testSetNamedPipeHandleState)
 endif()
+
+if(UNIX)
+    add_dependencies(tst_qprocess testUnixProcessParameters)
+endif()