[truetype] Remove TT_CONFIG_OPTION_NO_BORING_EXPANSION.

Despite its name, this option only gated 'avar' version 2 support.
FreeType 2.15.0 includes the complete boring-expansion set of proposals,
now released as ISO Open Font Format, fifth edition
(ISO/IEC 14496-22:2026).  Gating just avar2 no longer makes sense,
especially since it has also been shipping on Apple platforms for
four years.

* include/freetype/config/ftoption.h, devel/ftoption.h
  (TT_CONFIG_OPTION_NO_BORING_EXPANSION): Remove.
* src/truetype/ttgxvar.c (ft_var_load_avar): Remove configuration guards.

* docs/CHANGES: Updated.

All five Meson regression tests pass with the removed macro still
defined.  avar1 and avar2 coordinate mapping agrees with FontTools.

Assisted-by: OpenAI Codex

devel/ftoption.h

@@ -757,24 +757,6 @@ FT_BEGIN_HEADER
 #define TT_CONFIG_OPTION_GX_VAR_SUPPORT
 
 
-  /**************************************************************************
-   *
-   * Define `TT_CONFIG_OPTION_NO_BORING_EXPANSION` if you want to exclude
-   * support for 'boring' OpenType specification expansions.
-   *
-   *   https://github.com/harfbuzz/boring-expansion-spec
-   *
-   * Right now, the following features are covered:
-   *
-   *   - 'avar' version 2.0
-   *
-   * Most likely, this is a temporary configuration option to be removed in
-   * the near future, since it is assumed that eventually those features are
-   * added to the OpenType standard.
-   */
-/* #define TT_CONFIG_OPTION_NO_BORING_EXPANSION */
-
-
   /**************************************************************************
    *
    * Define `TT_CONFIG_OPTION_VARC` if you want to include support for

docs/CHANGES

@@ -1,3 +1,14 @@
+CHANGES BETWEEN 2.15.0 and 2.15.1 (YYYY-MMM-DD)
+
+  I. MISCELLANEOUS
+
+  - The  configuration  option  'TT_CONFIG_OPTION_NO_BORING_EXPANSION'
+    has been removed since FreeType now supports ISO Open Font Format,
+    Edition 5.
+
+
+======================================================================
+
 CHANGES BETWEEN 2.14.3 and 2.15.0 (2026-Oct-12)
 
   I. IMPORTANT CHANGES

include/freetype/config/ftoption.h

@@ -757,24 +757,6 @@ FT_BEGIN_HEADER
 #define TT_CONFIG_OPTION_GX_VAR_SUPPORT
 
 
-  /**************************************************************************
-   *
-   * Define `TT_CONFIG_OPTION_NO_BORING_EXPANSION` if you want to exclude
-   * support for 'boring' OpenType specification expansions.
-   *
-   *   https://github.com/harfbuzz/boring-expansion-spec
-   *
-   * Right now, the following features are covered:
-   *
-   *   - 'avar' version 2.0
-   *
-   * Most likely, this is a temporary configuration option to be removed in
-   * the near future, since it is assumed that eventually those features are
-   * added to the OpenType standard.
-   */
-/* #define TT_CONFIG_OPTION_NO_BORING_EXPANSION */
-
-
   /**************************************************************************
    *
    * Define `TT_CONFIG_OPTION_VARC` if you want to include support for

src/truetype/ttgxvar.c

@@ -373,12 +373,9 @@
     FT_Long   version;
     FT_Long   axisCount;
     FT_ULong  table_len;
-
-#ifndef TT_CONFIG_OPTION_NO_BORING_EXPANSION
     FT_ULong  table_offset;
     FT_ULong  store_offset;
     FT_ULong  axisMap_offset;
-#endif
 
 
     FT_TRACE2(( "AVAR " ));
@@ -391,9 +388,7 @@
       return;
     }
 
-#ifndef TT_CONFIG_OPTION_NO_BORING_EXPANSION
     table_offset = FT_STREAM_POS();
-#endif
 
     if ( FT_FRAME_ENTER( table_len ) )
       return;
@@ -401,11 +396,8 @@
     version   = FT_GET_LONG();
     axisCount = FT_GET_LONG();
 
-    if ( version != 0x00010000L
-#ifndef TT_CONFIG_OPTION_NO_BORING_EXPANSION
-         && version != 0x00020000L
-#endif
-       )
+    if ( version != 0x00010000L &&
+         version != 0x00020000L )
     {
       FT_TRACE2(( "bad table version\n" ));
       goto Exit;
@@ -462,7 +454,6 @@
       FT_TRACE5(( "\n" ));
     }
 
-#ifndef TT_CONFIG_OPTION_NO_BORING_EXPANSION
     if ( version < 0x00020000L )
       goto Exit;
 
@@ -490,7 +481,6 @@
       if ( error )
         goto Exit;
     }
-#endif
 
 
   Exit: