build(msg): disable SSL and Security in the host-side CycloneDDS build

The nested CycloneDDS CMake invocation in msg/CMakeLists.txt exists
only to produce the 'idlc' IDL compiler as a host-side code-gen
tool. It does not need CycloneDDS's TLS transport or DDS Security
features, but both default to ON in cyclonedds' upstream CMake.

When ENABLE_SSL=AUTO (the default), cyclonedds finds the system
OpenSSL and builds ddsi_ssl.c. On macos-latest the system OpenSSL
is 3.x, which removed the deprecated SSL_get_peer_certificate()
symbol used in our pinned cyclonedds revision (2023). The host
build then fails at link time with:

  Undefined symbols for architecture arm64:
    "_SSL_get_peer_certificate", referenced from:
        _dds_report_tls_version in ddsi_ssl.c.o

This broke every Zenoh-enabled board build on macOS (boards that
select CONFIG_MODULES_ZENOH pull in LIB_CDRSTREAM, which is what
triggers the nested build). v5 and v6x never hit it because they
don't enable Zenoh.

Passing -DENABLE_SSL=OFF -DENABLE_SECURITY=OFF skips compilation of
ddsi_ssl.c and the security plugins entirely. idlc is unaffected
(pure C code generation, no DDS runtime).

Verified locally on macOS ARM64: clean distclean + make
px4_fmu-v6xrt_default completes in 2090/2090 ninja steps, producing
a 2.1 MB .px4 with 59% FLASH used.

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

msg/CMakeLists.txt

@@ -455,6 +455,8 @@ if(CONFIG_LIB_CDRSTREAM)
 	execute_process(COMMAND ${CMAKE_COMMAND} ${PX4_SOURCE_DIR}/src/lib/cdrstream/cyclonedds
 			-DCMAKE_C_COMPILER=/usr/bin/gcc
 			-DBUILD_EXAMPLES=OFF
+			-DENABLE_SSL=OFF
+			-DENABLE_SECURITY=OFF
 			WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/idlc
 			RESULT_VARIABLE CMD_ERROR
 			OUTPUT_FILE CMD_OUTPUT )