CURL version constants.
-> ***NOTE:***
-> These constants have been added in v2.6.0, resp. v3.1.0.
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## Constants:
* CURL
Version string of the c-ares library, e.g. "1.11.0".
* IDN
Version string of the IDN library, e.g. "1.32".
+* ICONV
+ Version string of the iconv library. Added in v4.1.0.
+* BROTLI
+ Version string of the brotli library. Added in v4.1.0. Available if libcurl is v7.57.0 or more recent.
+* NGHTTP2
+ Version string of nghttp2. Added in v4.1.0. Available if libcurl is v7.66.0 or more recent.
+* QUIC
+ Version string of quiche/nghttp3. Added in v4.1.0. Available if libcurl is v7.66.0 or more recent.
+* CAINFO
+ Default path to the certificate bundle file. Added in v4.1.0. Available if libcurl is v7.70.0 or more recent.
+* CAPATH
+ Default path to the certificate bundle directory. Added in v4.1.0. Available if libcurl is v7.70.0 or more recent.
+* ZSTD
+ Version string of the zstd library. Added in v4.1.0. Available if libcurl is v7.72.0 or more recent.
+* HYPER
+ Version string of the hyper library. Added in v4.1.0. Available if libcurl is v7.75.0 or more recent.