keycode aliases: work around ChibiOS ch.h include guard (#21497)

lib/python/qmk/cli/generate/keycodes.py

@@ -96,6 +96,11 @@ def _generate_helpers(lines, keycodes):
 
 
 def _generate_aliases(lines, keycodes):
+    # Work around ChibiOS ch.h include guard
+    if 'CH_H' in [value['key'] for value in keycodes['aliases'].values()]:
+        lines.append('')
+        lines.append('#undef CH_H')
+
     lines.append('')
     lines.append('// Aliases')
     for key, value in keycodes["aliases"].items():

quantum/keymap_extras/keymap_swiss_de.h

@@ -27,6 +27,8 @@
 #include "keycodes.h"
 // clang-format off
 
+#undef CH_H
+
 // Aliases
 #define CH_SECT KC_GRV  // §
 #define CH_1    KC_1    // 1

quantum/keymap_extras/keymap_swiss_fr.h

@@ -27,6 +27,8 @@
 #include "keycodes.h"
 // clang-format off
 
+#undef CH_H
+
 // Aliases
 #define CH_SECT KC_GRV  // §
 #define CH_1    KC_1    // 1