Projucer: Fix linker error when building live-build DLL

extras/Projucer/Source/Utility/Helpers/jucer_MiscUtilities.cpp

@@ -26,6 +26,10 @@
 
 #include "../../Application/jucer_Headers.h"
 
+#ifdef BUILDING_JUCE_COMPILEENGINE
+ const char* getPreferredLinefeed() { return "\r\n"; }
+#endif
+
 //==============================================================================
 String joinLinesIntoSourceFile (StringArray& lines)
 {