Fix signal_stack_size for glibc 2.34

`SIGSTKSZ` is now defined as `sysconf(_SC_SIGSTKSZ)` which is not constexpr, and returns a long which throws off the `std::max` template deduction.

Signed-off-by: Enrico Belleri <idesmi@protonmail.com>

src/backend/x64/exception_handler_posix.cpp

@@ -60,7 +60,7 @@ private:
 SigHandler sig_handler;
 
 SigHandler::SigHandler() {
-    constexpr size_t signal_stack_size = std::max(SIGSTKSZ, 2 * 1024 * 1024);
+    const size_t signal_stack_size = std::max<size_t>(SIGSTKSZ, 2 * 1024 * 1024);
 
     stack_t signal_stack;
     signal_stack.ss_sp = std::malloc(signal_stack_size);