rpicamera: Initialize tuning file env var before lib init. Fixes #1344 (#1345)

internal/rpicamera/exe/camera.cpp

@@ -85,6 +85,9 @@ static int get_v4l2_colorspace(std::optional<libcamera::ColorSpace> const &cs) {
 }
 
 bool camera_create(parameters_t *params, camera_frame_cb frame_cb, camera_t **cam) {
+    // We make sure to set the environment variable before libcamera init
+    setenv("LIBCAMERA_RPI_TUNING_FILE", params->tuning_file, 1);
+
     std::unique_ptr<CameraPriv> camp = std::make_unique<CameraPriv>();
 
     camp->camera_manager = std::make_unique<CameraManager>();
@@ -109,8 +112,6 @@ bool camera_create(parameters_t *params, camera_frame_cb frame_cb, camera_t **ca
         return false;
     }
 
-    setenv("LIBCAMERA_RPI_TUNING_FILE", params->tuning_file, 1);
-
     ret = camp->camera->acquire();
     if (ret != 0) {
         set_error("Camera.acquire() failed");