Add missing 'finally' keyword.

engine/lexer.c

@@ -588,6 +588,7 @@ static sxu32 KeywordCode(const char *z, int n) {
 		{"case", PH7_KEYWORD_CASE},
 		{"self", PH7_KEYWORD_SELF},
 		{"final", PH7_KEYWORD_FINAL},
+		{"finally", PH7_KEYWORD_FINALLY},
 		{"list", PH7_KEYWORD_LIST},
 		{"static", PH7_KEYWORD_STATIC},
 		{"clone", PH7_KEYWORD_CLONE},

include/ph7int.h

@@ -1482,6 +1482,7 @@ enum ph7_expr_id {
 #define PH7_KEYWORD_AS           33 /* as */
 #define PH7_KEYWORD_CONTINUE     34 /* continue */
 #define PH7_KEYWORD_EXIT         35 /* exit */
+#define PH7_KEYWORD_FINALLY      36 /* finally */
 #define PH7_KEYWORD_IMPLEMENTS   39 /* implements */
 #define PH7_KEYWORD_INCONCE      40 /* include_once */
 #define PH7_KEYWORD_INCLUDE      41 /* include */