autoconf: #define the expanded version of localstatedir

Previously we defined LOCAL_STATE_DIR on the command line which relied
on shell expansion, now that we define it in autoconf.h we have to
expand it ourselves first. This broke the creation of the default unix
socket directory and file.

Without this commit autoconf.h contains:

    #define LOCAL_STATE_DIR "${prefix}/var"

now it will contain:

    #define LOCAL_STATE_DIR "/var/run/suricata"

(prefix respecting of course)

Fixes commit b6a610d.

configure.ac

@@ -2508,7 +2508,7 @@ AC_SUBST(e_logcertsdir)
 AC_SUBST(e_sysconfdir)
 AC_DEFINE_UNQUOTED([CONFIG_DIR],["$e_sysconfdir"],[Our CONFIG_DIR])
 AC_SUBST(e_localstatedir)
-AC_DEFINE_UNQUOTED([LOCAL_STATE_DIR],["$localstatedir"],[Our LOCAL_STATE_DIR])
+AC_DEFINE_UNQUOTED([LOCAL_STATE_DIR],["$e_localstatedir"],[Our LOCAL_STATE_DIR])
 AC_SUBST(e_datadir)
 AC_DEFINE_UNQUOTED([DATA_DIR],["$e_datadir"],[Our DATA_DIR])
 AC_SUBST(e_magic_file)