gallium/targets: resolve undefined reference to pipe_loader_sw_probe_dri

With the introduction of the pipe_loader_sw_probe_dri helper we
require the sw/dri winsys during linking stage despite it being
unused by any of the targets. This will cause a minor increase
in the resulting library which will be cleaned up via linker
options with upcoming patches.

v2: Link with libswdri.la only when available.

Reported-and-tested-by: Tom Stellard <thomas.stellard@amd.com> (v1)
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/gallium/targets/gbm/Makefile.am

@@ -50,6 +50,11 @@ gbm_gallium_drm_la_LIBADD = \
 	$(LIBDRM_LIBS) \
 	-lm
 
+if HAVE_DRI
+gbm_gallium_drm_la_LIBADD += \
+	$(top_builddir)/src/gallium/winsys/sw/dri/libswdri.la
+endif
+
 if NEED_PIPE_LOADER_XLIB
 gbm_gallium_drm_la_LIBADD += \
 	$(top_builddir)/src/gallium/winsys/sw/xlib/libws_xlib.la \

src/gallium/targets/opencl/Makefile.am

@@ -28,6 +28,11 @@ lib@OPENCL_LIBNAME@_la_LIBADD = \
 	-lclangBasic \
 	$(LLVM_LIBS)
 
+if HAVE_DRI
+lib@OPENCL_LIBNAME@_la_LIBADD += \
+	$(top_builddir)/src/gallium/winsys/sw/dri/libswdri.la
+endif
+
 if NEED_PIPE_LOADER_XLIB
 lib@OPENCL_LIBNAME@_la_LIBADD += \
 	$(top_builddir)/src/gallium/winsys/sw/xlib/libws_xlib.la \

src/gallium/targets/xa/Makefile.am

@@ -48,6 +48,11 @@ libxatracker_la_LIBADD = \
 	$(LIBUDEV_LIBS) \
 	$(LIBDRM_LIBS)
 
+if HAVE_DRI
+libxatracker_la_LIBADD += \
+	$(top_builddir)/src/gallium/winsys/sw/dri/libswdri.la
+endif
+
 if NEED_PIPE_LOADER_XLIB
 libxatracker_la_LIBADD += \
 	$(top_builddir)/src/gallium/winsys/sw/xlib/libws_xlib.la \