fix(simulator): build v4l2_capture as position-independent code

kern_simulator links with -pie, but the v4l2_capture static library
was compiled without -fPIC. On toolchains where GCC is not configured
with --enable-default-pie (e.g. Fedora 44), linking with
-DSIM_WEBCAM=ON fails:

  relocation R_X86_64_32 against `.rodata` can not be used when
  making a PIE object; recompile with -fPIE

A static archive is linked object-by-object into the executable, so
its relocations must be compatible with a PIR output. The lvgl and
wally targets already set POSITION_INDEPENDENT_CODE; v4l2_capture was
added later and did not. On Debian/Ubuntu the objects were position
independent by compiler default, which masked the problem.

Simulator-only change: it does not touch any device code path.

Author: Gabriel-Moya

simulator/CMakeLists.txt

@@ -252,6 +252,7 @@ if(SIM_WEBCAM)
             ${CMAKE_CURRENT_SOURCE_DIR}/platform/video_sim/v4l2_capture.c
         )
     endif()
+    set_target_properties(v4l2_capture PROPERTIES POSITION_INDEPENDENT_CODE ON)
     target_include_directories(v4l2_capture PRIVATE
         ${CMAKE_CURRENT_SOURCE_DIR}/platform/video_sim/include
         ${CMAKE_CURRENT_SOURCE_DIR}/platform/video_sim