Print rustc-link-search for the in-tree static openblas before everything else

[maoe]

Fixes #60.

The gnu linker searches libraries in the order of -L options and stops
the search when the first matching library is found. This means if
libopenblas.a is either in deliv.make_conf.c_extra_libs.search_path or
in deliv.make_conf.f_extra_libs.search_path, the in-tree libopenblas.a
won't be used.

This patch fixes the issue by printing the rustc-link-search instruction
for the in-tree openblas before everything else.

I've confirmed that the reproducer in #60 now prints the same config string across all distributions:

% git clone https://github.com/maoe/openblas-src.git
% cd openblas-src
% git checkout print-config-fix # this is the reproducer with this fix
% docker build -f Dockerfile.debian-bullseye -t openblas-src-bullseye .
% docker build -f Dockerfile.ubuntu-bionic -t openblas-src-bionic .
% docker build -f Dockerfile.ubuntu-focal -t openblas-src-focal .
% docker run -it --rm openblas-src-bullseye
OpenBLAS 0.3.10 NO_AFFINITY HASWELL MAX_THREADS=12
% docker run -it --rm openblas-src-bionic
OpenBLAS 0.3.10 NO_AFFINITY HASWELL MAX_THREADS=12
% docker run -it --rm openblas-src-focal
OpenBLAS 0.3.10 NO_AFFINITY HASWELL MAX_THREADS=12

[IvanUkhov]

@termoshtt, you probably know best if it is safe to change the order.

[termoshtt]

OK. I've confirm for listed environments. Thanks a lot :)