Revert "build-lldb-mi: Fix building with CMake 4.0"

This reverts commit debafe1a80.

This workaround is no longer needed as this is fixed in upstream
lldb-mi.

build-lldb-mi.sh

@@ -140,7 +140,6 @@ cd $BUILDDIR
 [ -n "$NO_RECONF" ] || rm -rf CMake*
 cmake \
     ${CMAKE_GENERATOR+-G} "$CMAKE_GENERATOR" \
-    -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
     -DCMAKE_INSTALL_PREFIX="$PREFIX" \
     -DCMAKE_BUILD_TYPE=Release \
     $CMAKEFLAGS \