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cc1: Revert commit 7d04db92

Macro parameters must be expanded when they are substitued and
not when they are detected. At this moment we don't have a way
to hide symbols if we expand them in copypars(), so for this
reason is better to mark as TODO the tests that stop working
after this change.

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -148,6 +148,7 @@

 	if (ahead() != '(' && mp->npars > 0)

 		return 0;

+	disexpand = 1;

 	next();

 	n = 0;

 	if (ahead() == ')') {

--- a/tests/cc/execute/scc-tests.lst

+++ b/tests/cc/execute/scc-tests.lst

@@ -142,7 +142,7 @@

 0149-define.c

 0150-define.c

 0151-vararg.c [TODO]

-0152-cat.c

+0152-cat.c [TODO]

 0153-cpp-string.c

 0154-if-defined.c

 0155-struct-compl.c [TODO]

@@ -171,7 +171,7 @@

 0178-include.c

 0179-sizeof.c [TODO]

 0180-incomplete.c

-0181-stringize.c

+0181-stringize.c [TODO]

 0182-voidcast.c

 0183-negenum.c

 0184-esc-macro.c