merge w3m-img for framebuffer support

* w3mimg/w3mimg.h: created
* w3mimg/x11/x11_w3mimg.c: created
* w3mimg/fb/fb_w3mimg.c: created
* w3mimgsize.c w3mimgdisplay.c: modified
* configure: modified
* XMakefile: modified
* config.h.dist: updated
From: Fumitoshi UKAI  <ukai@debian.or.jp>

w3m-img for framebuffer support
* http://homepage3.nifty.com/slokar/fb/
* w3mimg/fb/fb.c w3mimg/fb/fb.h
  w3mimg/fb/fb_img.c w3mimg/fb/fb_img.h
  w3mimg/fb/fb_gdkpixbuf.c w3mimg/fb/fb_gdkpixbuf.h
  w3mimg/fb/fb_imlib2.c w3mimg/fb/fb_imlib.h
  w3mimg/fb/readme.txt w3mimg/fb/license.txt: added
From: Hiroshi Kawashima <kei@sm.sony.co.jp>

config.h.dist

@@ -85,6 +85,11 @@ MATHLIB=-lm
 Z_CFLAGS=-I/usr/include
 ZLIB=-L/usr/lib -lz
 EXT_TARGETS=$(BOOKMARKER) $(HELPER) $(INFLATE)
+IMGCFLAGS=
+IMGLDFLAGS=
+IMGX11CFLAGS=
+IMGFBCFLAGS=
+IMGOBJS=
 GC_CFLAGS=
 GCLIB=gc/gc.a
 GCTARGET=gc/gc.a
@@ -125,6 +130,11 @@ MODEL=Linux.i686-monster-ja
 #define USE_EXTERNAL_URI_LOADER
 #undef USE_ALARM
 #undef USE_IMAGE
+#undef USE_W3MIMG_X11
+#undef USE_W3MIMG_FB
+#undef USE_IMLIB
+#undef USE_GDKPIXBUF
+#undef USE_IMLIB2
 #define USE_HELP_CGI
 #undef USE_XFACE