[PATCH] build fixes

[William Jon McCann]

Hi,

I can't remember if I sent these already or not...

It seems that in order to detect libsmbios correctly the AC_CHECK_LIB
needs to be wrapped with AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]).

Also if --disable-gtk-doc is used then all the PKG_CHECK_MODULES()
fail.  It seems that pkg-config stuff is only initialized in the
GTK_DOC_CHECK macro.

Jon
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