Fix shared spec of Time.rfc822/Time.rfc2822

Use the @method variable for method calls, don't hardcode the name. The
specs for Time.rfc822 did not test the method.

library/time/shared/rfc2822.rb

@@ -1,33 +1,33 @@
 describe :time_rfc2822, shared: true do
   it "parses RFC-822 strings" do
     t1 = (Time.utc(1976, 8, 26, 14, 30) + 4 * 3600)
-    t2 = Time.rfc2822("26 Aug 76 14:30 EDT")
+    t2 = Time.send(@method, "26 Aug 76 14:30 EDT")
     t1.should == t2
 
     t3 = Time.utc(1976, 8, 27, 9, 32) + 7 * 3600
-    t4 = Time.rfc2822("27 Aug 76 09:32 PDT")
+    t4 = Time.send(@method, "27 Aug 76 09:32 PDT")
     t3.should == t4
   end
 
   it "parses RFC-2822 strings" do
     t1 = Time.utc(1997, 11, 21, 9, 55, 6) + 6 * 3600
-    t2 = Time.rfc2822("Fri, 21 Nov 1997 09:55:06 -0600")
+    t2 = Time.send(@method, "Fri, 21 Nov 1997 09:55:06 -0600")
     t1.should == t2
 
     t3 = Time.utc(2003, 7, 1, 10, 52, 37) - 2 * 3600
-    t4 = Time.rfc2822("Tue, 1 Jul 2003 10:52:37 +0200")
+    t4 = Time.send(@method, "Tue, 1 Jul 2003 10:52:37 +0200")
     t3.should == t4
 
     t5 = Time.utc(1997, 11, 21, 10, 1, 10) + 6 * 3600
-    t6 = Time.rfc2822("Fri, 21 Nov 1997 10:01:10 -0600")
+    t6 = Time.send(@method, "Fri, 21 Nov 1997 10:01:10 -0600")
     t5.should == t6
 
     t7 = Time.utc(1997, 11, 21, 11, 0, 0) + 6 * 3600
-    t8 = Time.rfc2822("Fri, 21 Nov 1997 11:00:00 -0600")
+    t8 = Time.send(@method, "Fri, 21 Nov 1997 11:00:00 -0600")
     t7.should == t8
 
     t9 = Time.utc(1997, 11, 24, 14, 22, 1) + 8 * 3600
-    t10 = Time.rfc2822("Mon, 24 Nov 1997 14:22:01 -0800")
+    t10 = Time.send(@method, "Mon, 24 Nov 1997 14:22:01 -0800")
     t9.should == t10
 
     begin
@@ -36,11 +36,11 @@
       # ignore
     else
       t11 = Time.utc(1969, 2, 13, 23, 32, 54) + 3 * 3600 + 30 * 60
-      t12 = Time.rfc2822("Thu, 13 Feb 1969 23:32:54 -0330")
+      t12 = Time.send(@method, "Thu, 13 Feb 1969 23:32:54 -0330")
       t11.should == t12
 
       t13 = Time.utc(1969, 2, 13, 23, 32, 0) + 3 * 3600 + 30 * 60
-      t14 = Time.rfc2822(" Thu,
+      t14 = Time.send(@method, " Thu,
       13
         Feb
           1969
@@ -50,16 +50,16 @@
     end
 
     t15 = Time.utc(1997, 11, 21, 9, 55, 6)
-    t16 = Time.rfc2822("21 Nov 97 09:55:06 GMT")
+    t16 = Time.send(@method, "21 Nov 97 09:55:06 GMT")
     t15.should == t16
 
     t17 = Time.utc(1997, 11, 21, 9, 55, 6) + 6 * 3600
-    t18 = Time.rfc2822("Fri, 21 Nov 1997 09 :   55  :  06 -0600")
+    t18 = Time.send(@method, "Fri, 21 Nov 1997 09 :   55  :  06 -0600")
     t17.should == t18
 
     -> {
       # inner comment is not supported.
-      Time.rfc2822("Fri, 21 Nov 1997 09(comment):   55  :  06 -0600")
+      Time.send(@method, "Fri, 21 Nov 1997 09(comment):   55  :  06 -0600")
     }.should raise_error(ArgumentError)
   end
 end