Remove build conditions inside .c plugin files

Rather use the Makefile to specify which files must be built
Fix color builds with test plugins enabled (test_scanrate gave an empty
.o file)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27886 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/SOURCES

@@ -150,10 +150,6 @@ robotfindskitten.c
 xobox.c
 spacerocks.c
 
-/* Plugins needing the grayscale lib on low-depth LCDs */
-fire.c
-plasma.c
-
 blackjack.c
 bounce.c
 bubbles.c
@@ -176,6 +172,10 @@ starfield.c
 vu_meter.c
 wormlet.c
 
+/* Plugins needing the grayscale lib on low-depth LCDs */
+fire.c
+plasma.c
+
 #ifdef HAVE_LCD_COLOR
 clix.c
 ppmviewer.c
@@ -225,9 +225,12 @@ test_codec.c
 test_core_jpeg.c
 #endif
 test_disk.c
-test_fps.c
 #ifdef HAVE_LCD_BITMAP
+test_fps.c
 test_gfx.c
+#if LCD_DEPTH < 4 && !defined(SIMULATOR)
+test_scanrate.c
+#endif
 #ifndef HAVE_LCD_COLOR
 test_grey.c
 test_greylib_bitmap_scale.c
@@ -243,9 +246,8 @@ test_resize.c
 #if CONFIG_CODEC == SWCODEC
 test_sampr.c
 #endif
-test_scanrate.c
 #ifdef HAVE_TOUCHSCREEN
 test_touchscreen.c
 #endif
 test_viewports.c
-#endif
+#endif /* HAVE_TEST_PLUGINS */