meson: remove cppfs dependency

The dependency on the c++fs library is something very old from the C++14
era and is no longer necessary with a modern compiler.  Remove the
explicit dependency from the meson setup.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I524ff9db3e47255ced0526b65e04b0512c1d6d59
diff --git a/meson.build b/meson.build
index 039f39a..c47034c 100644
--- a/meson.build
+++ b/meson.build
@@ -112,7 +112,7 @@
     'phosphor-user-manager',
     'mainapp.cpp',
     dependencies: user_manager_dep,
-    link_args: ['-lcrypt', '-lstdc++fs'],
+    link_args: ['-lcrypt' ],
     cpp_args: ['-DBOOST_ALL_NO_LIB', '-DBOOST_SYSTEM_NO_DEPRECATED', '-DBOOST_ERROR_CODE_HEADER_ONLY'],
     install: true,
 )