Cleanup: Remove data duplication from large array in eevee_camera.hh

Use `inline constexpr` instead of `static const` to prevent these
variables from being duplicated in each translation unit that includes
the eevee_camera.hh header (was included into 17 different object files
with MSVC).

Differential Revision: https://developer.blender.org/D16200

source/blender/draw/engines/eevee_next/eevee_camera.hh

@@ -13,7 +13,7 @@ namespace blender::eevee {
 
 class Instance;
 
-static const float cubeface_mat[6][4][4] = {
+inline constexpr float cubeface_mat[6][4][4] = {
     /* Pos X */
     {{0.0f, 0.0f, -1.0f, 0.0f},
      {0.0f, -1.0f, 0.0f, 0.0f},