kbuild/genksyms: handle va_list type

genksyms currently does not handle va_list. Add the __builtin_va_list
keyword as a type. This reduces the amount of syntax errors thrown,
but so far no export symbol has a type with a va_list argument, so
there is currently no bug in the end result.

Note: this patch does not regenerate shipped parser files.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.com>

scripts/genksyms/keywords.gperf

@@ -27,6 +27,7 @@ __typeof, TYPEOF_KEYW
 __typeof__, TYPEOF_KEYW
 __volatile, VOLATILE_KEYW
 __volatile__, VOLATILE_KEYW
+__builtin_va_list, VA_LIST_KEYW
 # According to rth, c99 defines _Bool, __restrict, __restrict__, restrict.  KAO
 _Bool, BOOL_KEYW
 _restrict, RESTRICT_KEYW

scripts/genksyms/parse.y

@@ -98,6 +98,7 @@ static void record_compound(struct string_list **keyw,
 %token VOID_KEYW
 %token VOLATILE_KEYW
 %token TYPEOF_KEYW
+%token VA_LIST_KEYW
 
 %token EXPORT_SYMBOL_KEYW
 
@@ -261,6 +262,7 @@ simple_type_specifier:
 	| DOUBLE_KEYW
 	| VOID_KEYW
 	| BOOL_KEYW
+	| VA_LIST_KEYW
 	| TYPE			{ (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
 	;