./configure: set natdynlink=false on -no-native-compiler
./configure: set natdynlink=false on -no-native-compiler

In PR#7172, Daniel Bünzli remarks that even if an user does only "make
world install" only, intentionally not installing the native code
compiler, the configuration variables exposed through
$(ocamlc -where)/Makefile.config will be misleading as they indicate
the configuration-time prediction that this installation has a native
compiler and support native dynlink.

The -no-native-compiler switch allows to avoid this issue by
intentionally indicating at configure-time that no native compiler
shall be built. However, its current implementation forgot to also
explicitly disable native dynlinking. Changing this fixes the
Makefile.config information and has no impact on the compiler build
process (a build with ARCH=none will never hit the {all,install}opt of
dynlink/Makefile that inspect NATDYNLINK).

On regression risk: it is easy to check in ./configure that this
change only affects configuration when the -no-native-compiler option
is passed, which did not exist before (late in) 4.03+dev.

gerdstolpmann/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,eliberis/ocaml,eliberis/ocaml,yunxing/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,yunxing/ocaml,yunxing/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,msprotz/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,yunxing/ocaml,eliberis/ocaml