Do not use forkfd for INTEGRITY.

unix is defined for the integrity target. Remove the general |integrity
and only special-case forkfd.

Change-Id: I8752e62659c28261b2309013fad6e8a82b9397d1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/io.pri

@@ -131,18 +131,20 @@ win32 {
                 io/qsettings_winrt.cpp \
                 io/qstorageinfo_stub.cpp
     }
-} else:unix|integrity {
+} else:unix {
         SOURCES += \
                 io/qfsfileengine_unix.cpp \
                 io/qfilesystemengine_unix.cpp \
                 io/qlockfile_unix.cpp \
                 io/qprocess_unix.cpp \
-                io/qfilesystemiterator_unix.cpp \
+                io/qfilesystemiterator_unix.cpp
-                io/forkfd_qt.cpp
-        HEADERS += \
-                ../3rdparty/forkfd/forkfd.h
-        INCLUDEPATH += ../3rdparty/forkfd
 
+        !integrity {
+            SOURCES += io/forkfd_qt.cpp
+            HEADERS += \
+                     ../3rdparty/forkfd/forkfd.h
+            INCLUDEPATH += ../3rdparty/forkfd
+        }
         !nacl:mac: {
             SOURCES += io/qsettings_mac.cpp
             OBJECTIVE_SOURCES += io/qurl_mac.mm