VLCKit: remove trailing slash in Pre-Compile.sh

Remove trailing backslash from the prefix variable. Other locations
in the code adds the required backslash.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

projects/macosx/framework/Pre-Compile.sh

@@ -52,7 +52,7 @@ target_lib="${target}/${lib}"            # Should we consider using a different
 target_plugins="${target}/${plugins}"    # Should we consider using a different well-known folder like shared resources?
 target_share="${target}/${share}"        # Should we consider using a different well-known folder like shared resources?
 linked_libs=""
-prefix=".libs/"
+prefix=".libs"
 suffix="dylib"
 
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