Kill config.h and just force-include acconf.h in non-pch builds

Makefile.target

automation/tests/aegisub.cpp

libaegisub/ass/dialogue_parser.cpp

libaegisub/common/cajun/elements.cpp

libaegisub/common/cajun/reader.cpp

libaegisub/common/calltip_provider.cpp

libaegisub/common/charset_6937.cpp

libaegisub/common/charset_conv.cpp

libaegisub/common/color.cpp

libaegisub/common/dispatch.cpp

libaegisub/common/file_mapping.cpp

libaegisub/common/fs.cpp

libaegisub/common/hotkey.cpp

libaegisub/common/json.cpp

libaegisub/common/kana_table.cpp

libaegisub/common/karaoke_matcher.cpp

libaegisub/common/keyframe.cpp

libaegisub/common/log.cpp

libaegisub/common/mru.cpp

libaegisub/common/option.cpp