lib/fmt/meson.build: remove obsolete clang 14 workaround

Android NDK r27 has clang 18 and I don't feel like supporting clang 14.

src/lib/fmt/meson.build

@@ -1,13 +1,5 @@
 libfmt = dependency('fmt', version: '>= 9', fallback: ['fmt', 'fmt_dep'])
 
-if compiler.get_id() == 'clang' and compiler.version().version_compare('<15')
-  libfmt = declare_dependency(
-    dependencies: libfmt,
-    # suppress bogus clang 14 warning (the version in Android NDK r25b)
-    compile_args: ['-Wno-unused-local-typedef'],
-  )
-endif
-
 fmt = static_library(
   'fmt',
   'ExceptionFormatter.cxx',