Convert host-ipmid -> libipmid

phosphor-host-ipmid now exposes a library along with headers for
interfacing with the ipmi daemon. Compile and link against the new
library.

Change-Id: I1447474a97578e74cda028474c1cff830e9a23aa
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/configure.ac b/configure.ac
index d7987c9..b2fa58d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@
 AX_APPEND_COMPILE_FLAGS([-Wall -Werror], [CXXFLAGS])
 
 # Checks for libraries.
-AC_CHECK_HEADER([host-ipmid], [AC_MSG_ERROR(["phosphor-host-ipmid required and not found."])])
+PKG_CHECK_MODULES([LIBIPMID], [libipmid])
 AC_CHECK_HEADER(experimental/filesystem, ,[AC_MSG_ERROR([Could not find experimental/filesystem...libstdc++fs developement package required])])
 
 # Checks for library functions.