egl: reset blob cache set/get functions on terminate

Fixes errors seen with eglSetBlobCacheFuncsANDROID on Android when
running dEQP that terminates and reinitializes a display.

Fixes: 6f5b57093b "egl: add support for EGL_ANDROID_blob_cache"
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

src/egl/main/eglapi.c

@@ -676,6 +676,10 @@ eglTerminate(EGLDisplay dpy)
       /* do not reset disp->Driver */
       disp->ClientAPIsString[0] = 0;
       disp->Initialized = EGL_FALSE;
+
+      /* Reset blob cache funcs on terminate. */
+      disp->BlobCacheSet = NULL;
+      disp->BlobCacheGet = NULL;
    }
 
    RETURN_EGL_SUCCESS(disp, EGL_TRUE);