Define 'auto' keyword.

engine/lexer.c

@@ -542,6 +542,7 @@ static sxu32 KeywordCode(const char *z, int n) {
 		{"public", PH7_KEYWORD_PUBLIC},
 		{"static", PH7_KEYWORD_STATIC},
 		/* Data types */
+		{"auto", PH7_KEYWORD_AUTO},
 		{"bool", PH7_KEYWORD_BOOL},
 		{"callback", PH7_KEYWORD_CALLBACK},
 		{"char", PH7_KEYWORD_CHAR},

include/ph7int.h

@@ -1601,6 +1601,7 @@ enum ph7_expr_id {
 #define PH7_KEYWORD_RETURN       54 /* return */
 #define PH7_KEYWORD_BREAK        55 /* break */
 #define PH7_KEYWORD_GOTO         56 /* goto */
+#define PH7_KEYWORD_AUTO         0x000800 /* auto: MUST BE A POWER OF TWO */
 #define PH7_KEYWORD_VOID         0x001000 /* void: MUST BE A POWER OF TWO */
 #define PH7_KEYWORD_CHAR         0x002000 /* char: MUST BE A POWER OF TWO */
 #define PH7_KEYWORD_BOOL         0x004000 /* bool: MUST BE A POWER OF TWO */