r-zip: update to 3.0.0, drop obsolete libr-zip.patch

[bshor]

Fixes #366. cc @pekkarr (maintainer)

Updates r-zip to 3.0.0 and removes libr-zip.patch, which no longer applies to the rewritten 3.0.0 source (now bundles a Mbed TLS subset for WinZip AES crypto + new source files). That stale patch was the cause of the prepare() failure that kept the package pinned at 2.3.3.

Why dropping the patch is safe

• The miniz symbol rename is obsolete. The mz_ → r_mz_ rename worked around symbol collisions (upstream issue Refresh depends for all r pkgs #98). zip 3.0.0's Makevars builds with PKG_CFLAGS = $(C_VISIBILITY) (-fvisibility=hidden), which hides the bundled-miniz symbols at link time — the modern fix for that collision.
• Nothing consumes the exported libr-zip.so. r-zip is the only package in the repo that referenced libr-zip; no other PKGBUILD links /usr/lib/libr-zip.so. The package now ships the standard usr/lib/R/library/zip/libs/zip.so like every other R package.

Other changes

• r-cli stays in makedepends (CRAN LinkingTo: cli, added in r-zip: add r-cli makedepend for CRAN 3.0.0 #362) and is also added to optdepends (it's in 3.0.0 Suggests).
• optdepends refreshed to 3.0.0 Suggests: added r-callr, r-curl, r-webfakes; dropped r-covr (no longer suggested).
• checkdepends / repo_makedepends: added r-curl and r-webfakes — the new test-http.R range-request tests need them (the suite's skip_if_not_installed only skips under _R_CHECK_FORCE_SUGGESTS_=false, so they run and require the deps present).

Verification

Built locally with makepkg:

• Compiles cleanly (mbedtls subset + cli headers), produces zip.so.
• Test suite: FAIL 0 | PASS 520 | SKIP 5 (skips are Windows-only / long-running).
• Packaged contents: usr/lib/R/library/zip/libs/zip.so + usr/share/licenses/r-zip/LICENSE, no libr-zip.so.