Add newline at end of KRHangulMapping.h

without this, compiling output of GCC 11 -E -fdirectives-only fails with:

ooxml_tokens.inl:3524:32: error: stray '#' in program

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100392

--- liborcus/src/liborcus/ooxml_tokens.inl.orig	2021-05-01 18:12:37.490131155 +0200
+++ liborcus/src/liborcus/ooxml_tokens.inl	2021-05-01 18:12:50.994119453 +0200
@@ -3521,4 +3521,4 @@
     "zoomToFit"  // 3517
 };
 
-size_t token_name_count = 3518;
\ No newline at end of file
+size_t token_name_count = 3518;