Get `gn gen` to succeed on Windows

third_party/sqlite/src/ext/icu/sqliteicu.h

Index: third_party/sqlite/src/ext/icu/sqliteicu.h
diff --git a/third_party/sqlite/src/ext/icu/sqliteicu.h b/third_party/sqlite/src/ext/icu/sqliteicu.h
new file mode 100644
index 0000000000000000000000000000000000000000..69b42f982102954b11c1652525a93586b201c7e8
--- /dev/null
+++ b/third_party/sqlite/src/ext/icu/sqliteicu.h
@@ -0,0 +1,27 @@
+/*
+** 2008 May 26
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This header file is used by programs that want to link against the
+** ICU extension.  All it does is declare the sqlite3IcuInit() interface.
+*/
+#include "sqlite3.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  /* __cplusplus */
+
+int sqlite3IcuInit(sqlite3 *db);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif  /* __cplusplus */
+