automake: introduce helper variable

- gallium_pipe_loader_winsys_libs

Will be used in upcomming commits to reduce duplication
in the build.

v2: Drop the megadriver/static_target variables.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/gallium/Automake.inc

@@ -151,3 +151,19 @@ GALLIUM_XVMC_LIB_DEPS += $(LLVM_LIBS)
 GALLIUM_OMX_LIB_DEPS += $(LLVM_LIBS)
 
 endif
+
+
+GALLIUM_PIPE_LOADER_WINSYS_LIBS = \
+	$(top_builddir)/src/gallium/winsys/sw/null/libws_null.la
+
+if HAVE_DRISW
+GALLIUM_PIPE_LOADER_WINSYS_LIBS += \
+	$(top_builddir)/src/gallium/winsys/sw/dri/libswdri.la
+endif
+
+if NEED_WINSYS_XLIB
+GALLIUM_PIPE_LOADER_WINSYS_LIBS += \
+	$(top_builddir)/src/gallium/winsys/sw/xlib/libws_xlib.la \
+	-lX11 -lXext -lXfixes \
+	$(LIBDRM_LIBS)
+endif