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Add #elif

The implemetation of elif is really easy, it is a #else chained
with a #if.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -214,6 +214,7 @@

 	PRAGMA,

 	ERROR,

 	IFDEF,

+	ELIF,

 	IFNDEF,

 	UNDEF,

 	ENDIF,

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -522,6 +522,13 @@

 }

 static void

+elif(void)

+{

+	elseclause();

+	ifclause(0, 0);

+}

+

+static void

 undef(void)

 {

 	Symbol *sym;

@@ -549,6 +556,7 @@

 		{LINE, line},

 		{IFDEF, ifdef},

 		{IF, cppif},

+		{ELIF, elif},

 		{IFNDEF, ifndef},

 		{ELSE, elseclause},

 		{ENDIF, endif},

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -263,6 +263,7 @@

 		{"line", LINE, LINE},

 		{"ifdef", IFDEF, IFDEF},

 		{"if", IF, IF},

+		{"elif", ELIF, ELIF},

 		{"else", ELSE, ELSE},

 		{"ifndef", IFNDEF, IFNDEF},

 		{"endif", ENDIF, ENDIF},

-- 

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