build: drop extra check

Drop an extra check for a specific sdbusplus header file after checking
for the library.

Change-Id: If20864a1998434ae9de0689e324ddf7c6406777d
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/configure.ac b/configure.ac
index c3a92c7..aafc80e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,8 +25,7 @@
 AX_APPEND_COMPILE_FLAGS([-fpic -Wall -Werror], [CXXFLAGS])
 
 # Checks for header files.
-AC_CHECK_HEADER(sdbusplus/server.hpp, ,[AC_MSG_ERROR([Could not find sdbusplus/server.hpp...sdbusplus development package required])])
-AC_CHECK_HEADER(experimental/filesystem, ,[AC_MSG_ERROR([Could not find experimental/filesystem...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