configure.ac: correct name of device-mapper-devel for RHEL

The RHEL and Fedora package name for development device mapper library is device-mapper-devel

Signed-off-by: Daniel Black <daniel.black@au.ibm.com>
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

configure.ac

@@ -64,7 +64,7 @@ fi
 
 AC_CHECK_LIB([devmapper], [dm_task_create],
 	[DEVMAPPER_LIBS=-ldevmapper],
-	[AC_MSG_FAILURE([The libdevmapper development library is required by petitboot.  Try installing the package libdevmapper-dev or libdevmapper-devel.])]
+	[AC_MSG_FAILURE([The libdevmapper development library is required by petitboot.  Try installing the package libdevmapper-dev or device-mapper-devel.])]
 )
 
 AC_ARG_WITH([fdt],