correction about "V3D seems to runs on software on master!"

I add virgl...but it happens the same without it.

 Configuration summary:

        prefix:          /home/pi/mesa
        includedir:      include

        OpenGL:          yes (ES1: yes ES2: yes)
        OSMesa:          no

        DRI platform:    drm
        DRI drivers:     no
        DRI driver dir:  /home/pi/mesa/dri

        GLX:             DRI-based

        EGL:             yes
        EGL drivers:     builtin:egl_dri2 builtin:egl_dri3
        GBM:             yes
        EGL/Vulkan/VL platforms:   x11 drm surfaceless

        Vulkan drivers:  no

        llvm:            no

        Gallium drivers: vc4 v3d kmsro virgl
        Gallium st:      mesa
        HUD lmsensors:   no

        Shared-glapi:    yes


my preinstalled mesa on clean raspbian 32 bit :

pi@raspberrypi:~ $ glxinfo -B
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Broadcom (0x14e4)
    Device: V3D 4.2 (0xffffffff)
    Version: 19.1.0
    Accelerated: yes
    Video memory: 3906MB
    Unified memory: yes
    Preferred profile: compat (0x2)
    Max core profile version: 0.0
    Max compat profile version: 2.1
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.0
OpenGL vendor string: Broadcom
OpenGL renderer string: V3D 4.2
OpenGL version string: 2.1 Mesa 19.1.0-devel
OpenGL shading language version string: 1.20

OpenGL ES profile version string: OpenGL ES 3.0 Mesa 19.1.0-devel
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00


after compiled master mesa:

pi@raspberrypi:~ $  LD_LIBRARY_PATH=/home/pi/mesa/lib
LIBGL_DRIVERS_PATH=/home/pi/mesa/lib/dri/ glxinfo -B
name of display: :0.0
libGL error: MESA-LOADER: failed to open vc4 (search paths
/home/pi/mesa/lib/dri/)
libGL error: failed to load driver: vc4
libGL error: MESA-LOADER: failed to open vc4 (search paths
/home/pi/mesa/lib/dri/)
libGL error: failed to load driver: vc4
libGL error: MESA-LOADER: failed to open swrast (search paths
/home/pi/mesa/lib/dri/)
libGL error: failed to load driver: swrast
X Error of failed request:  GLXBadContext
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  60
  Current serial number in output stream:  59

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