[w3m-dev 03804] fix autoconf

* acinclude.m4 (AC_W3M_MODEL): deleted
	(AC_W3M_COLOR): default enable
	(AC_W3M_ANSI_COLOR): default enable
	(AC_W3M_BG_COLOR): default enable
	(AC_W3M_SHOW_PARAMS): deleted
	(AC_W3M_DICT): default enable
	(AC_W3M_HISTORY): default enable
	(AC_W3M_VIEW_UNSEENOBJECTS): deleted
	(AC_W3M_FORMAT_NICE): deleted
	(AC_W3M_ID_EXT): deleted
	(AC_W3M_FTPPASS_HOSTNAMEGEN): deleted
	(AC_W3M_NNTP): default enabled
	(AC_W3M_LANG): autodetect whether japanese is enabled
	(AC_W3M_KANJI_SYMBOLS): default enabled
	(AC_W3M_EMACS_LIKE_LINEEDIT): deleted
	(AC_W3M_VI_PREC_NUM): deleted
	(AC_W3M_MARK): deleted
	(AC_W3M_LABEL_TOPLINE): deleted
	(AC_W3M_NEXTPAGE_TOPLINE): deleted
	(AC_W3M_SSL): fix without ssl
	(AC_W3M_IMAGE): default enabled
	(AC_W3M_XFACE): check uncompface
	(AC_W3M_IPv6): enable_ipv6 if inet6 lib found
* configure.in (AC_PROG_CPP): added
From: Fumitoshi UKAI  <ukai@debian.or.jp>

configure.in

@@ -7,6 +7,7 @@ dnl Checks for programs.
 dnl AC_PROG_CXX
 AC_PROG_AWK
 AC_PROG_CC
+AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
@@ -19,7 +20,6 @@ AC_EXEEXT
 AC_SUBST(EXEEXT)
 
 AC_W3M_VERSION
-AC_W3M_MODEL
 
 AC_W3M_LANG
 AC_W3M_KANJI_SYMBOLS
@@ -29,24 +29,13 @@ AC_W3M_ANSI_COLOR
 AC_W3M_BG_COLOR
 
 AC_W3M_MIGEMO
-AC_W3M_EMACS_LIKE_LINEEDIT
-AC_W3M_VI_PREC_NUM
-AC_W3M_MARK
-
-AC_W3M_LABEL_TOPLINE
-AC_W3M_NEXTPAGE_TOPLINE
 
 AC_W3M_MOUSE
 
 AC_W3M_MENU
 AC_W3M_COOKIE
-AC_W3M_SHOW_PARAMS
 AC_W3M_DICT
 AC_W3M_HISTORY
-AC_W3M_VIEW_UNSEENOBJECTS
-AC_W3M_FORMAT_NICE
-AC_W3M_ID_EXT
-AC_W3M_FTPPASS_HOSTNAMEGEN
 AC_W3M_NNTP
 AC_W3M_GOPHER