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diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-khmer-machine.rl b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-khmer-machine.rl
deleted file mode 100644
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--- a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-khmer-machine.rl
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@@ -1,113 +0,0 @@
-/*
- * Copyright © 2011,2012 Google, Inc.
- *
- * This is part of HarfBuzz, a text shaping library.
- *
- * Permission is hereby granted, without written agreement and without
- * license or royalty fees, to use, copy, modify, and distribute this
- * software and its documentation for any purpose, provided that the
- * above copyright notice and the following two paragraphs appear in
- * all copies of this software.
- *
- * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
- * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
- * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
- * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
- * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- *
- * Google Author(s): Behdad Esfahbod
- */
-
-#ifndef HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
-#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
-
-#include "hb.hh"
-
-%%{
- machine khmer_syllable_machine;
- alphtype unsigned char;
- write data;
-}%%
-
-%%{
-
-# Same order as enum khmer_category_t. Not sure how to avoid duplication.
-C = 1;
-V = 2;
-ZWNJ = 5;
-ZWJ = 6;
-PLACEHOLDER = 11;
-DOTTEDCIRCLE = 12;
-Coeng= 14;
-Ra = 16;
-Robatic = 20;
-Xgroup = 21;
-Ygroup = 22;
-VAbv = 26;
-VBlw = 27;
-VPre = 28;
-VPst = 29;
-
-c = (C | Ra | V);
-cn = c.((ZWJ|ZWNJ)?.Robatic)?;
-joiner = (ZWJ | ZWNJ);
-xgroup = (joiner*.Xgroup)*;
-ygroup = Ygroup*;
-
-# This grammar was experimentally extracted from what Uniscribe allows.
-
-matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
-syllable_tail = xgroup matra_group xgroup (Coeng.c)? ygroup;
-
-
-broken_cluster = (Coeng.cn)* (Coeng | syllable_tail);
-consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
-other = any;
-
-main := |*
- consonant_syllable => { found_syllable (consonant_syllable); };
- broken_cluster => { found_syllable (broken_cluster); };
- other => { found_syllable (non_khmer_cluster); };
-*|;
-
-
-}%%
-
-#define found_syllable(syllable_type) \
- HB_STMT_START { \
- if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
- for (unsigned int i = ts; i < te; i++) \
- info[i].syllable() = (syllable_serial << 4) | khmer_##syllable_type; \
- syllable_serial++; \
- if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
- } HB_STMT_END
-
-static void
-find_syllables_khmer (hb_buffer_t *buffer)
-{
- unsigned int p, pe, eof, ts, te, act HB_UNUSED;
- int cs;
- hb_glyph_info_t *info = buffer->info;
- %%{
- write init;
- getkey info[p].khmer_category();
- }%%
-
- p = 0;
- pe = eof = buffer->len;
-
- unsigned int syllable_serial = 1;
- %%{
- write exec;
- }%%
-}
-
-#undef found_syllable
-
-#endif /* HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH */