std.net.curl doesn't work with -static

[trikko]

Compiling an app that uses curl with musl+ldc+alpine results in a single working static (portable!) executable. However, std.net.curl does not work correctly because it attempts to load the dynamic library libcurl.so.

The main reason is that the check at this line fails, likely because dlopen does not work in static binaries, and thus the symbol is incorrectly not detected. I guess it works with static symbols on dynamic executable?

Incidentally, a simple program using etc.c.curl works because the symbols are present, as can be confirmed by analyzing the executable file.

Perhaps a different check should be used (e.g., __traits(compiles)?), but the entire structure would then need to be adjusted accordingly.

Linked libs: "-lcurl", "-lunistring", "-lbrotlicommon", "-lbrotlienc", "-licuuc", "-licudata", "-lcares_static", "-lnghttp2", "-lidn2", "-lpsl", "-lssl", "-lcrypto", "-lzstd", "-lbrotlidec", "-lz"