Fix copyright statement

Compiler was previously adding source code when copyright statement was
in the source because the __Copyright variable was being marked as
internal by built-in optimization pass 'internalize', and removed by built-in
optimizers (likely globalopt, but not verified) because it wasn't used.

Fix this by adding it to the 'internalize-public-api-list' option.

clambcc/clambc-compiler.py

@@ -493,7 +493,7 @@ def createInputSourceFile(clangLLVM: ClangLLVM, name: str, args: list, options:
 
 def optimize(clangLLVM: ClangLLVM, inFile: str, outFile: str, sigFile: str, inputSourceFile: str, standardCompiler: bool) -> int:
 
-    internalizeAPIList = "_Z10entrypointv,entrypoint,__clambc_kind,__clambc_virusname_prefix,__clambc_virusnames,__clambc_filesize,__clambc_match_counts,__clambc_match_offsets,__clambc_pedata"
+    internalizeAPIList = "_Z10entrypointv,entrypoint,__clambc_kind,__clambc_virusname_prefix,__clambc_virusnames,__clambc_filesize,__clambc_match_counts,__clambc_match_offsets,__clambc_pedata,__Copyright"
     if standardCompiler:
         internalizeAPIList += ",main"