add openssl package (#16)

Vendors OpenSSL 3.4.1 as static libraries (libcrypto.a, libssl.a) for
openpilot, following the same pattern as other vendored packages.

Uses module name openssl3 to avoid case-insensitive filesystem conflict
with pyOpenSSL's OpenSSL module on macOS.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

openssl/openssl3/__init__.py

@@ -0,0 +1,11 @@
+import os
+
+DIR = os.path.join(os.path.dirname(__file__), "install")
+LIB_DIR = os.path.join(DIR, "lib")
+INCLUDE_DIR = os.path.join(DIR, "include")
+
+
+def smoketest():
+  assert os.path.isfile(os.path.join(LIB_DIR, "libcrypto.a")), "libcrypto.a not found"
+  assert os.path.isfile(os.path.join(LIB_DIR, "libssl.a")), "libssl.a not found"
+  assert os.path.isdir(os.path.join(INCLUDE_DIR, "openssl")), "openssl headers not found"