libstdc++: disable embedded tzdata for esp toolchain#3
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Fixes espressif/esp-idf#18522.
The static
tzdata.zifile embedded by libstdc++ forstd::chrono::tzdbadds ~105KB to the library and ends up in final binaries whenever third-party code touches the relevant chrono APIs, even though it is rarely used in an embedded context. Disable it by default for*-esp*hosts.