Revert "egl: drop EGL driver name"

This reverts commit 6414d6bd8d.

This is needed to apply the next revert.

src/egl/drivers/dri2/egl_dri2.c

@@ -3244,4 +3244,6 @@ _eglInitDriver(_EGLDriver *dri2_drv)
    dri2_drv->API.GLInteropQueryDeviceInfo = dri2_interop_query_device_info;
    dri2_drv->API.GLInteropExportObject = dri2_interop_export_object;
    dri2_drv->API.DupNativeFenceFDANDROID = dri2_dup_native_fence_fd;
+
+   dri2_drv->Name = "DRI2";
 }

src/egl/drivers/haiku/egl_haiku.cpp

@@ -325,5 +325,7 @@ _eglInitDriver(_EGLDriver *driver)
 
 	driver->API.SwapBuffers = haiku_swap_buffers;
 
+	driver->Name = "Haiku";
+
 	TRACE("API Calls defined\n");
 }

src/egl/main/eglapi.c

@@ -615,7 +615,8 @@ eglInitialize(EGLDisplay dpy, EGLint *major, EGLint *minor)
       _eglCreateExtensionsString(disp);
       _eglCreateAPIsString(disp);
       snprintf(disp->VersionString, sizeof(disp->VersionString),
-               "%d.%d", disp->Version / 10, disp->Version % 10);
+               "%d.%d (%s)", disp->Version / 10, disp->Version % 10,
+               disp->Driver->Name);
    }
 
    /* Update applications version of major and minor if not NULL */

src/egl/main/egldriver.c

@@ -98,6 +98,8 @@ _eglMatchDriver(_EGLDisplay *dpy)
    }
 
    if (best_drv) {
+      _eglLog(_EGL_DEBUG, "the best driver is %s",
+            best_drv->Name);
       dpy->Driver = best_drv;
       dpy->Initialized = EGL_TRUE;
    }

src/egl/main/egldriver.h

@@ -75,6 +75,8 @@ extern "C" {
  */
 struct _egl_driver
 {
+   const char *Name;  /**< name of this driver */
+
    _EGLAPI API;  /**< EGL API dispatch table */
 };