[compat] fix spinlock default ctor causing crash on OpenBSD

Signed-off-by: lizzie <lizzie@eden-emu.dev>

docs/build/OpenBSD.md

@@ -2,7 +2,7 @@
 
 ```sh
 pkg_add -u
-pkg_add cmake nasm git boost unzip--iconv autoconf-2.72p0 bash ffmpeg glslang gmake llvm-19.1.7p3
+pkg_add cmake nasm git boost unzip--iconv autoconf-2.72p0 bash ffmpeg glslang gmake llvm-19.1.7p3 qt6
 git --recursive https://git.eden-emu.dev/eden-emu/eden
 cmake -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -DDYNARMIC_USE_PRECOMPILED_HEADERS=OFF -DCMAKE_BUILD_TYPE=Debug -DENABLE_QT=OFF -DENABLE_OPENSSL=OFF -DENABLE_WEB_SERVICE=OFF -B /usr/obj/eden
 ```

src/dynarmic/src/dynarmic/backend/x64/block_of_code.cpp

@@ -225,10 +225,10 @@ bool IsUnderRosetta() {
 
 }  // anonymous namespace
 
-#ifdef __OpenBSD__
-constexpr auto default_cg_mode = Xbyak::DontSetProtectRWE;
+#ifdef DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT
+static const auto default_cg_mode = Xbyak::DontSetProtectRWE;
 #else
-constexpr auto default_cg_mode = nullptr; //Allow RWE
+static const auto default_cg_mode = nullptr; //Allow RWE
 #endif
 
 BlockOfCode::BlockOfCode(RunCodeCallbacks cb, JitStateInfo jsi, size_t total_code_size, std::function<void(BlockOfCode&)> rcp)

src/dynarmic/src/dynarmic/common/spin_lock_x64.cpp

@@ -37,7 +37,7 @@ namespace {
 struct SpinLockImpl {
     void Initialize();
 
-    Xbyak::CodeGenerator code;
+    Xbyak::CodeGenerator code = Xbyak::CodeGenerator(4096, Xbyak::DontSetProtectRWE);
 
     void (*lock)(volatile int*);
     void (*unlock)(volatile int*);