Fix ASAN linker warning suppression to Linux only

Update the ASAN linker warning fix to only apply the
-Wl,--no-warn-rwx-segments flag on Linux platforms, as this
flag is specific to the Linux linker and not applicable to
macOS or Windows builds.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmake/targets/BuildBun.cmake

@@ -868,6 +868,12 @@ if(NOT WIN32)
       target_link_libraries(${bun} PUBLIC
         -fsanitize=address
       )
+      # Suppress ASAN-related linker warnings on Linux
+      if(LINUX)
+        target_link_options(${bun} PUBLIC
+          -Wl,--no-warn-rwx-segments
+        )
+      endif()
     endif()
 
     target_compile_options(${bun} PUBLIC
@@ -912,6 +918,12 @@ if(NOT WIN32)
       target_link_libraries(${bun} PUBLIC
         -fsanitize=address
       )
+      # Suppress ASAN-related linker warnings on Linux
+      if(LINUX)
+        target_link_options(${bun} PUBLIC
+          -Wl,--no-warn-rwx-segments
+        )
+      endif()
     endif()
   endif()
 else()