build: remove -fsanitize-undefined-trap-on-error

Meson complains; it's probably not that important anymore when using the
`-Db_sanitize` options.

meson.build:36: WARNING: Consider using the built-in option for sanitizers instead of using "-fsanitize-undefined-trap-on-error".

Signed-off-by: Ran Benita <ran@unusedvar.com>

meson.build

@@ -17,7 +17,6 @@ dir_libexec = get_option('prefix')/get_option('libexecdir')/'xkbcommon'
 # Compiler flags.
 cflags = [
     '-fno-strict-aliasing',
-    '-fsanitize-undefined-trap-on-error',
     '-Wno-unused-parameter',
     '-Wno-missing-field-initializers',
     '-Wpointer-arith',