gallium: Move egl drivers to targets

gallium: Move egl drivers to targets

Atteched output from git commit:
 rename src/gallium/{winsys/drm => targets}/Makefile.egl (100%)
 rename src/gallium/{winsys/drm/intel/egl => targets/egl-i915}/Makefile (86%)
 rename src/gallium/{winsys/drm/i965/egl => targets/egl-i915}/dummy.c (100%)
 rename src/gallium/{winsys/drm/i965/egl => targets/egl-i965}/Makefile (86%)
 rename src/gallium/{winsys/drm/intel/egl => targets/egl-i965}/dummy.c (100%)
 rename src/gallium/{winsys/drm/nouveau/egl => targets/egl-nouveau}/Makefile (88%)
 rename src/gallium/{winsys/drm/nouveau/egl => targets/egl-nouveau}/dummy.c (100%)
 rename src/gallium/{winsys/drm/radeon/egl => targets/egl-radeon}/Makefile (87%)
 rename src/gallium/{winsys/drm/radeon/egl => targets/egl-radeon}/dummy.c (100%)
 create mode 100644 src/gallium/targets/egl-swrast/Makefile
 create mode 100644 src/gallium/targets/egl-swrast/swrast_glue.c
 rename src/gallium/{winsys/drm/vmware/egl => targets/egl-vmwgfx}/Makefile (86%)
 rename src/gallium/{winsys/drm/swrast/egl => targets/egl-vmwgfx}/dummy.c (100%)
 delete mode 100644 src/gallium/winsys/drm/swrast/Makefile
 delete mode 100644 src/gallium/winsys/drm/swrast/core/Makefile
 delete mode 100644 src/gallium/winsys/drm/swrast/core/swrast_drm_api.c
 delete mode 100644 src/gallium/winsys/drm/swrast/egl/Makefile
 delete mode 100644 src/gallium/winsys/drm/vmware/egl/dummy.c