configure: don't set DL_LIBS to 'none required' #2141
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This copies the AC_SEARCH_LIBS check from the main strongswan configure.ac.
When building networkmanager-strongswan with slibtool if fails.
This is because configure.ac uses AC_SEARCH_LIBS to find dlopen which sets the value of $ac_cv_search_dlopen to 'none required' which then gets set in DL_LIBS and passed to slibtool.
With GNU libtool it silently ignores the unknown arguments.
Gentoo issue: https://bugs.gentoo.org/914100