Update configure.ac to reflect HAVE_READLINE statue

Author: mcuee

src/configure.ac

@@ -80,7 +80,7 @@ AM_PROG_CC_C_O
 # Checks for libraries.
 AC_CHECK_LIB([termcap], [tputs])
 AC_CHECK_LIB([ncurses], [tputs])
-AC_CHECK_LIB([readline], [readline])
+AC_CHECK_LIB([readline], [readline], [have_readline=yes])
 AH_TEMPLATE([HAVE_LIBELF],
             [Define if ELF support is enabled via libelf])
 AC_CHECK_LIB([elf], [elf_getshdrstrndx], [have_libelf=yes])