newlib-nano: Create symlinks for nano-suffixed libs

If existing board's .specs are used for linking of a user's application,
then instead of normally used libs like libc.a & libstdc++.a might be
requested their "nano"-suffixed siblings: libc_nano.a, libstdc++_nano etc.

That way:
----------------------------->8---------------------------
%rename link_gcc_c_sequence	myboard_link_gcc_c_sequence

*myboard_libc:
%{!specs=nano.specs:-lc} %{specs=nano.specs:-lc_nano}

*link_gcc_c_sequence:
%(myboard_link_gcc_c_sequence) --start-group %G %(myboard_libc) --end-group
----------------------------->8---------------------------

Our companion newlib-nano libs are all built optimized for size, so we'd like
to use them for linking. But given linker will see "-lc_nano -lstdc++_nano"
on its command line non-suffixed libs will be ignored.

To solve it we create those "_nano"-suffixed libraries as simple symlinks to
existing libs..

Fixes https://github.com/crosstool-ng/crosstool-ng/issues/1458.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

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