[v3] let doxygen find generated header files

[Benjamin Kosnik]

>The current setup hardcodes i686-pc-linux-gnu in the doxyfile and lets
>doxygen fail on other setups. Pass the current configuration from the
>Makefile to run_doxygen and use it for doxygen.

Thanks for fixing this up.

You should use host_alias, not build_alias, since that's what
include/Makefile.am uses for this directory. Please change that bit...

>--- libstdc++-v3/Makefile.am~	2004-08-03 08:32:59.000000000 +0200
>+++ libstdc++-v3/Makefile.am	2004-11-13 14:40:55.000000000 +0100
>@@ -35,18 +35,21 @@
> 	-(srcdir=`cd ${top_srcdir}; ${PWD_COMMAND}`; \
> 	  builddir=`${PWD_COMMAND}`; \
> 	  ${SHELL} ${srcdir}/docs/doxygen/run_doxygen \
>+	            --build_alias=$(build_alias) \
> 	            --mode=user $${srcdir} $${builddir})
> 
> doxygen-maint:
> 	-(srcdir=`cd ${top_srcdir}; ${PWD_COMMAND}`; \
> 	  builddir=`${PWD_COMMAND}`; \
> 	  ${SHELL} ${srcdir}/docs/doxygen/run_doxygen \
>+	            --build_alias=$(build_alias) \
> 	            --mode=maint $${srcdir} $${builddir})

Also, I think this should be quote immediate so

+	            --build_alias=$${host_alias} \


With these changes it's ok by me.

-benajmin