Windows/MSVC: Add ENABLE_64_BIT_WORDS macro

Allow setting of ENABLE_64_BIT_WORDS preprocessor variable for
libFLAC_dynamic, libFLAC_static and test_libFLAC projects and x64
platform.

Patch-from: lvqcl <lvqcl.mail@gmail.com>
diff --git a/src/test_libFLAC/test_libFLAC.vcxproj b/src/test_libFLAC/test_libFLAC.vcxproj
index 052c9d9..0cb431b 100644
--- a/src/test_libFLAC/test_libFLAC.vcxproj
+++ b/src/test_libFLAC/test_libFLAC.vcxproj
@@ -98,7 +98,7 @@
     <ClCompile>

       <Optimization>Disabled</Optimization>

       <AdditionalIncludeDirectories>.;..\libFLAC\include;..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>

-      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;FLAC__NO_DLL;DEBUG;CPU_IS_LITTLE_ENDIAN=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>

+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;FLAC__NO_DLL;DEBUG;ENABLE_64_BIT_WORDS;CPU_IS_LITTLE_ENDIAN=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>

       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>

       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>

       <WarningLevel>Level3</WarningLevel>

@@ -146,7 +146,7 @@
       <OmitFramePointers>true</OmitFramePointers>

       <WholeProgramOptimization>true</WholeProgramOptimization>

       <AdditionalIncludeDirectories>.;..\libFLAC\include;..\..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>

-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;FLAC__NO_DLL;CPU_IS_LITTLE_ENDIAN=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>

+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;FLAC__NO_DLL;ENABLE_64_BIT_WORDS;CPU_IS_LITTLE_ENDIAN=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>

       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>

       <BufferSecurityCheck>false</BufferSecurityCheck>

       <WarningLevel>Level3</WarningLevel>