Fix for PPC build

modules/juce_core/native/juce_osx_ObjCHelpers.h

@@ -70,9 +70,11 @@ namespace
     typedef id (*MsgSendSuperFn) (struct objc_super*, SEL, ...);
     static inline MsgSendSuperFn getMsgSendSuperFn() noexcept   { return (MsgSendSuperFn) (void*) objc_msgSendSuper; }
 
+   #if ! JUCE_PPC
     typedef double (*MsgSendFPRetFn) (id, SEL op, ...);
     static inline MsgSendFPRetFn getMsgSendFPRetFn() noexcept   { return (MsgSendFPRetFn) (void*) objc_msgSend_fpret; }
    #endif
+   #endif
 }
 
 //==============================================================================