targets/dri-i915: Convert to static/shared pipe-drivers

v2:
 - Drop inclusion of the winsys wrapper and softpipe/llvmpipe.
 - Remove old Makefile.am, target.c.
 - Correctly append i915 to the megadrivers list.

Cc: Stephane Marchesin <stephane.marchesin@gmail.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Rob Clark <robclark@freedesktop.org>
Tested-by: Thomas Helland <thomashelland90 at gmail.com>
Acked-by: Tom Stellard <thomas.stellard@amd.com>
diff --git a/configure.ac b/configure.ac
index b7e90d7..a358c10 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1926,7 +1926,7 @@
             PKG_CHECK_MODULES([INTEL], [libdrm_intel >= $LIBDRM_INTEL_REQUIRED])
             gallium_require_drm_loader
             GALLIUM_DRIVERS_DIRS="$GALLIUM_DRIVERS_DIRS i915"
-            gallium_check_st "i915/drm" "dri-i915" "xa/i915"
+            gallium_check_st "i915/drm" "dri/i915" "xa/i915"
             ;;
         xilo)
             HAVE_GALLIUM_ILO=yes
@@ -2208,7 +2208,6 @@
 		src/gallium/state_trackers/xa/Makefile
 		src/gallium/state_trackers/xvmc/Makefile
 		src/gallium/targets/Makefile
-		src/gallium/targets/dri-i915/Makefile
 		src/gallium/targets/dri-ilo/Makefile
 		src/gallium/targets/dri-swrast/Makefile
 		src/gallium/targets/dri-vmwgfx/Makefile