Set of changes so that "obtrusive" syntactic elements in a
C/C++/ObjC preprocessor line (e.g. an unbalanced string quote or unmatched paren) don't interact syntactically with stuff outside the CPP line. (c-get-state-before-change-function, c-before-font-lock-function, c-anchored-cpp-prefix): new language variables. (c-cpp-message-directives): Handle "#warning" in C, C++ and ObjC.
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