cppunit: also build 64-bit DLL always with PDB file

Note: this maps to /Z7 apparently:
<DebugInformationFormat>OldStyle</DebugInformationFormat>

https://msdn.microsoft.com/en-us/library/bb629394.aspx
lists various options but passing /p:DebugSymbols=true /p:DebugType=full
/p:PdbFile=... to msbuild.exe by itself doesn't do anything while
patching the project file works.

Change-Id: I888b5f6af7be519e2d35b749873ae7d35bb0bf9d
Reviewed-on: https://gerrit.libreoffice.org/56605
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

external/cppunit/enable-win32-debug.patch

@@ -16,3 +16,19 @@
        <SubSystem>Console</SubSystem>
        <OutputFile>.\ReleaseDll\cppunit_dll.dll</OutputFile>
        <ImportLibrary>.\ReleaseDll\cppunit_dll.lib</ImportLibrary>
+@@ -237,7 +237,6 @@
+       <SuppressStartupBanner>true</SuppressStartupBanner>
+       <WarningLevel>Level3</WarningLevel>
+       <RuntimeTypeInfo>true</RuntimeTypeInfo>
+-      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+       <AdditionalIncludeDirectories>..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+       <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;CPPUNIT_BUILD_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+       <AssemblerListingLocation>.\ReleaseDll\</AssemblerListingLocation>
+@@ -266,6 +266,7 @@
+     <Link>
+       <SuppressStartupBanner>true</SuppressStartupBanner>
+       <LinkDLL>true</LinkDLL>
++      <GenerateDebugInformation>true</GenerateDebugInformation>
+       <SubSystem>Console</SubSystem>
+       <OutputFile>.\ReleaseDll\cppunit_dll.dll</OutputFile>
+       <ImportLibrary>.\ReleaseDll\cppunit_dll.lib</ImportLibrary>