configure.ac: fix static build with idn2 and unistring

Commit 78db40f2 did not fix static build failure

AC_SEARCH_LIBS prepends the library to LIBS as a result -lunistring is added before -lidn2. To fix static build, we must set -lunistring after -lidn2

Fixes:

Signed-off-by: Fabrice Fontaine fontaine.fabrice@gmail.com

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