Bug #1649350. Ensure EXT_LEXER_DECL defined on all platforms.
Bug #1649350. Ensure EXT_LEXER_DECL defined on all platforms.

R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone