Guard src/ipcrypt.c against libsodium < 1.0.21#125
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The ipcrypt API (crypto_ipcrypt_*, sodium_ip2bin, sodium_bin2ip) was introduced in libsodium 1.0.21. Systems shipping an older libsodium (e.g. RHEL 8/9 with libsodium-1.0.18 from EPEL) lack the header <sodium/crypto_ipcrypt.h> entirely, causing the build to fail with "undeclared identifier / implicit function declaration" errors for every symbol in src/ipcrypt.c. Fix: wrap the entire implementation in a __has_include() guard (__has_include is supported by both GCC and Clang). When the header is present the code compiles unchanged. When it is absent, thin error- stub wrappers are compiled instead; they satisfy the linker, allow the extension to install, and raise ERRCODE_FEATURE_NOT_SUPPORTED at runtime with a clear "requires libsodium >= 1.0.21" message. Coded by Claude, tested by me.
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The ipcrypt API (crypto_ipcrypt_*, sodium_ip2bin, sodium_bin2ip) was introduced in libsodium 1.0.21. Systems shipping an older libsodium (e.g. RHEL 8/9 with libsodium-1.0.18 from EPEL) lack the header <sodium/crypto_ipcrypt.h> entirely, causing the build to fail with "undeclared identifier / implicit function declaration" errors for every symbol in src/ipcrypt.c.
Fix: wrap the entire implementation in a __has_include() guard (__has_include is supported by both GCC and Clang). When the header is present the code compiles unchanged. When it is absent, thin error- stub wrappers are compiled instead; they satisfy the linker, allow the extension to install, and raise ERRCODE_FEATURE_NOT_SUPPORTED at runtime with a clear "requires libsodium >= 1.0.21" message.
Coded by Claude, tested by me.