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Add #endif clauses

I forgot it in the rewriting ^^!!!!.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -202,6 +202,7 @@

 	IFDEF,

 	IFNDEF,

 	UNDEF,

+	ENDIF,

 	EOFTOK

 };

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -477,6 +477,15 @@

 }

 static void

+endif(void)

+{

+	if (cppctx == 0)

+		error("#endif without #if");

+	if (!ifstatus[--cppctx])

+		--cppoff;

+}

+

+static void

 elseclause(void)

 {

 	if (cppctx == 0)

@@ -513,6 +522,7 @@

 		{IFDEF, ifdef},

 		{IFNDEF, ifndef},

 		{ELSE, elseclause},

+		{ENDIF, endif},

 		{UNDEF, undef},

 		{PRAGMA, pragma},

 		{ERROR, usererr},

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -235,6 +235,7 @@

 		{"ifdef", IFDEF, IFDEF},

 		{"else", ELSE, ELSE},

 		{"ifndef", IFNDEF, IFNDEF},

+		{"endif", ENDIF, ENDIF},

 		{"undef", UNDEF, UNDEF},

 		{"pragma", PRAGMA, PRAGMA},

 		{"error", ERROR, ERROR}