qdrawhelper.cpp: Fix build on MIPS without DSP support

The qt_memfill32_asm_mips_dsp function is only declared if 
QT_COMPILER_SUPPORTS_MIPS_DSP is defined, so we can't reference it 
unless the same macro is defined.

Backporting an upstream patch to fix this issue.

Upstream commit:

  https://qt.gitorious.org/qt/qtbase/commit/2ca323ccd4f25f409eff8fc0c9804099b78c2bde

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

From 2ca323ccd4f25f409eff8fc0c9804099b78c2bde Mon Sep 17 00:00:00 2001
From: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Date: Tue, 11 Nov 2014 13:11:54 +0100
Subject: [PATCH] Android: Compile for MIPS

The qt_memfill32_asm_mips_dsp function is only declared if
QT_COMPILER_SUPPORTS_MIPS_DSP is defined, so we can't reference it
unless the same macro is defined.

Change-Id: Ib959b4b969b699ca78804394206266469b4ebf64
Task-number: QTBUG-36017
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 src/gui/painting/qdrawhelper.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index f2d27a0..6482cc5 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -6829,7 +6829,7 @@ void qInitDrawhelperAsm()
     qt_fetch_radial_gradient = qt_fetch_radial_gradient_neon;
 #endif
 
-#ifdef Q_PROCESSOR_MIPS_32
+#if defined(Q_PROCESSOR_MIPS_32) && defined(QT_COMPILER_SUPPORTS_MIPS_DSP)
     qt_memfill32 = qt_memfill32_asm_mips_dsp;
 #endif // Q_PROCESSOR_MIPS_32
 
-- 
1.7.1