buildroot.config: Enable C++ support, LIBDRM, and Mesa 3D

configs/buildroot.config

@@ -29,6 +29,8 @@ BR2_EXTRA_GCC_CONFIG_OPTIONS="--enable-softfloat"
 BR2_TOOLCHAIN_HEADERS_AT_LEAST="6.1"
 BR2_TOOLCHAIN_GCC_AT_LEAST_14=y
 BR2_TOOLCHAIN_GCC_AT_LEAST="14"
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_INSTALL_LIBSTDCPP=y
 BR2_SSP_NONE=y
 # BR2_SSP_REGULAR is not set
 # BR2_SSP_STRONG is not set
@@ -42,4 +44,13 @@ BR2_TARGET_ROOTFS_CPIO_FULL=y
 # BR2_TARGET_ROOTFS_CPIO_DRACUT is not set
 BR2_TARGET_ROOTFS_CPIO_NONE=y
 # BR2_TARGET_ROOTFS_TAR is not set
-BR2_PACKAGE_BUSYBOX_CONFIG="busybox.config"
+BR2_PACKAGE_LIBDRM=y
+BR2_PACKAGE_LIBDRM_HAS_ATOMIC=y
+BR2_PACKAGE_PROVIDES_LIBEGL="mesa3d"
+BR2_PACKAGE_MESA3D=y
+BR2_PACKAGE_MESA3D_GALLIUM_DRIVER=y
+BR2_PACKAGE_MESA3D_DRIVER=y
+BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VIRGL=y
+BR2_PACKAGE_MESA3D_GBM=y
+BR2_PACKAGE_MESA3D_OPENGL_EGL=y
+BR2_PACKAGE_PROVIDES_LIBGBM="mesa3d"