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## Fix `globalSymbols` support on POSIX ### Summary Fix `-d:globalSymbols` on POSIX platforms by defining `RTLD_GLOBAL` alongside `RTLD_NOW` in `system/dyncalls.nim`. On Linux and macOS, `RTLD_NOW` is defined locally in `dyncalls.nim`, but `RTLD_GLOBAL` was not. As a result, enabling `-d:globalSymbols` could fail because `RTLD_GLOBAL` was undeclared. This change: * defines `RTLD_GLOBAL` as `0x100` on Linux, * defines `RTLD_GLOBAL` as `0x8` on macOS, * imports `RTLD_GLOBAL` from `<dlfcn.h>` on other POSIX platforms. These values are consistent with the existing POSIX constants already used elsewhere in the Nim source tree. ### Motivation `globalSymbols` is intended to load dynamic libraries with `RTLD_GLOBAL` so that their exported symbols are available to subsequently loaded shared libraries. This is needed, for example, when a dynamically loaded library later loads a plugin or provider that depends on symbols from the first library. Without this fix, `-d:globalSymbols` cannot be used reliably for that purpose on POSIX systems. ### Testing Tested on Linux with an AArch64 target. A program using dynamically loaded OpenSSL libraries and a subsequently loaded OpenSSL provider failed when the OpenSSL libraries were loaded with the default local symbol visibility. Using `RTLD_GLOBAL` made the same program work correctly. After this change, building the original Nim program with: ```text -d:globalSymbols ``` successfully loads the OpenSSL libraries with global symbol visibility, and the provider-based TLS 1.2 and TLS 1.3 tests both pass. The same behavior was also independently reproduced using direct `dlopen()` / `dlsym()` calls: ```text RTLD_LOCAL -> TLS 1.2 failed RTLD_GLOBAL -> TLS 1.2 passed ``` Signed-off-by: Takeyoshi Kikuchi <kikuchi@centurysys.co.jp>