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[cc2] Fix negation unary operator symbol

ONEG used the same symbol as OSUB

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -83,7 +83,7 @@

 	['\t']  = {     stmt,    NULL,                     0},

 	['~']   = {     NULL,   unary, .u.op =          OCPL},

-	['-']   = {     NULL,   unary, .u.op =          ONEG},

+	['_']   = {     NULL,   unary, .u.op =          ONEG},

 	['\'']  = {     NULL,   unary, .u.op =         OADDR},

 	['@']   = {     NULL,   unary, .u.op =          OPTR},

 	['g']   = {     NULL,   unary, .u.op =         OCAST},