Fux https://github.com/msys2/MINGW-packages/issues/9539 by including the test executable.

mingw-w64-dlfcn/PKGBUILD

@@ -4,7 +4,7 @@ _realname=dlfcn
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=1.3.0
-pkgrel=1
+pkgrel=2
 pkgdesc="A wrapper for dlfcn to the Win32 API (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
@@ -62,9 +62,8 @@ package() {
   install -Dm644 README.md "${pkgdir}${MINGW_PREFIX}/share/doc/${_realname}/README.md"
   install -Dm644 COPYING "${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}/LICENSE"
   # We do not want transitive dependencies on libdll.dll so remove it
-  # as well as a test executable.
   # We installed static last so the CMake files pertain to a static
   # build already.
-  rm -rf ${pkgdir}${MINGW_PREFIX}/bin
+  rm -f ${pkgdir}${MINGW_PREFIX}/bin/libdl.dll
   rm -f ${pkgdir}${MINGW_PREFIX}/lib/libdl.dll.a
 }