lib/fmt: add meson.build

src/lib/fmt/meson.build

@@ -0,0 +1,13 @@
+libfmt = dependency('fmt', version: '>= 7', 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_dep = declare_dependency(
+  dependencies: libfmt,
+)