Get `gn gen` to succeed on Windows

third_party/sqlite/misc.patch

+Index: src/expr.c
+===================================================================
+--- src/expr.c  2009-09-08 12:16:11.000000000 -0700
++++ src/expr.c  2009-09-23 16:58:47.000000000 -0700
+@@ -804,7 +804,9 @@
+       }else{
+         int nSize = exprStructSize(p);
+         memcpy(zAlloc, p, nSize);
+-        memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
++        if( EXPR_FULLSIZE>nSize ){
++          memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
++        }
+       }
+ 
+       /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
+Index: src/func.c
+===================================================================
+--- src/func.c  2009-09-04 13:37:42.000000000 -0700
++++ src/func.c  2009-09-14 18:18:18.000000000 -0700
+@@ -1020,7 +1020,7 @@
+       }
+     }
+     if( zCharSet ){
+-      sqlite3_free(azChar);
++      sqlite3_free((void*)azChar);
+     }
+   }
+   sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);