winsys/i915/sw: consolidate C sources list into Makefile.sources

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

src/gallium/winsys/i915/sw/Makefile.am

 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
+include Makefile.sources
 include $(top_srcdir)/src/gallium/Automake.inc
 
 AM_CFLAGS = \
 
 noinst_LTLIBRARIES = libi915sw.la
 
-libi915sw_la_SOURCES = \
-	i915_sw_batchbuffer.c \
-	i915_sw_buffer.c \
-	i915_sw_fence.c \
-	i915_sw_winsys.c
+libi915sw_la_SOURCES = $(C_SOURCES)

src/gallium/winsys/i915/sw/Makefile.sources

+C_SOURCES := \
+	i915_sw_batchbuffer.c \
+	i915_sw_buffer.c \
+	i915_sw_fence.c \
+	i915_sw_winsys.c

src/gallium/winsys/i915/sw/SConscript

 
 env = env.Clone()
 
-i915_sw_sources = [
-    'i915_sw_batchbuffer.c',
-    'i915_sw_buffer.c',
-    'i915_sw_winsys.c',
-    'i915_sw_fence.c',
-]
+i915_sw_sources = env.ParseSourceList('Makefile.sources', 'C_SOURCES')
 
 i915sw = env.ConvenienceLibrary(
     target ='i915sw',