build: check for experimental/filesystem

Check for experimental/filesystem instead of experimental/any

Change-Id: I21dbb225a4aae7f1f2bab01249d421cac0e3854e
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/configure.ac b/configure.ac
index 02ac495..42e73c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@
 PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus], ,[AC_MSG_ERROR([The openbmc/sdbusplus package is required])])
 PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus], ,[AC_MSG_ERROR([The openbmc/sdeventplus package is required])])
 PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces], [], [AC_MSG_ERROR(["phosphor-dbus-interfaces required and not found."])])
-AC_CHECK_HEADER(experimental/any, ,[AC_MSG_ERROR([Could not find experimental/any...libstdc++fs development package required])])
+AC_CHECK_HEADER(experimental/filesystem, ,[AC_MSG_ERROR([Could not find experimental/filesystem...libstdc++fs development package required])])
 
 # Checks for library functions.
 LT_INIT # Required for systemd linking