[Bug 41790] Make libnice dependency optional

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41790

--- Comment #2 from Will Thompson <will.thompson at collabora.co.uk> 2011-10-31 09:23:51 PDT ---
+    AC_SUBST(NICE_CFLAGS)
+    AC_SUBST(NICE_LIBS)
+else
+    NICE_CFLAGS=
+    NICE_LIBS=
+fi

If you're not AC_SUBSTing the empty variables, can't you just leave the else
clause out entirely?

I don't really like how this patch litters quite so many ifdefs around, even
down to changing the number of arguments to gabble_file_transfer_channel_new()…

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