test/Makefile.w32: fix minor typo

test/Makefile.w32

@@ -8,10 +8,9 @@ INCPATH = -I"$(%WATCOM)/h/nt" -I"$(%WATCOM)/h" -I"../src/video/khronos"
 CFLAGS = -bt=nt -d0 -q -bm -5s -fp5 -fpi87 -sg -oteanbmier -ei
 CFLAGS+= -wx -wcd=303
 CFLAGS+= -DSDL_MAIN_HANDLED
-
 CFLAGS+= -DHAVE_OPENGL
 GLLIBS = opengl32.lib
 
-TNSRCS = testnative.obj testnativew32.obj
+TNSRCS = testnative.c testnativew32.c
 
 !include watcom.mif