Add missing 1994/shapiro/shapiro.alt.c

With a tip from Leo the missing alt code has been added to the website.

Ta, Leo (🦁⭐️🌌)!

1994/shapiro/.entry.json

@@ -45,6 +45,14 @@
             "display_via_github" : false,
             "entry_text" : "author's hints"
         },
+        {
+            "file_path" : "shapiro.alt.c",
+            "inventory_order" : 150,
+            "OK_to_edit" : true,
+            "display_as" : "c",
+            "display_via_github" : true,
+            "entry_text" : "author provided unobfuscated and formatted source code"
+        },
         {
             "file_path" : "1994_shapiro.tar.bz2",
             "inventory_order" : 1415926535,