configure.ac: remove unused LLVM variables

LLVM_BINDIR is completely unused while others such as LLVM_LIBDIR are
used only internally. In the latter case there's no need to AC_SUBST it.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Tobias Droste <tdroste@gmx.de>
1 file changed