perl: drop 110-always_use_miniperl.patch

perl: drop 110-always_use_miniperl.patch

The patch was introduced in commit 4c57844f0f04 ("lang/perl: Add hack to
make perl always use miniperl during build"), but it is not actually
necessary. By setting $perl to a non-empty value (using 'perl' as is
common on desktop distros), the logic works as intended and selects the
correct perl binary for host and target builds.

As miniperl just symlinks to host perl for target builds, the main
effect of this change is not unconditionally passing `-Ilib -I.`
anymore. This seems like a good thing; host libraries should be used
with host perl by default.

Signed-off-by: Matthias Schiffer <redacted>