[mingw-qwt] add missing patch

[sailer]

commit c69631b3b3feaf39ac33da0ee8cd2d616b6c2248
Author: Thomas Sailer <t.sailer at alumni.ethz.ch>
Date:   Fri Jan 2 07:50:43 2015 +0100

    add missing patch

 mingw-qwt.spec |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/mingw-qwt.spec b/mingw-qwt.spec
index 14c23ed..5278d9b 100644
--- a/mingw-qwt.spec
+++ b/mingw-qwt.spec
@@ -17,6 +17,8 @@ Source:         http://downloads.sourceforge.net/%{name1}/%{name1}-%{version}.ta
 Patch50:        qwt-6.1.1-pkgconfig.patch
 # use QT_INSTALL_ paths instead of custom prefix
 Patch51:        qwt-6.1.0-qt_install_paths.patch
+# parallel-installable qt5 version
+Patch52:        qwt-qt5.patch
 BuildRequires:  mingw32-filesystem
 BuildRequires:  mingw64-filesystem
 BuildRequires:  mingw32-qt