Fixing some warnings on Linux

gm/gmmain.cpp

Index: gm/gmmain.cpp
===================================================================
--- gm/gmmain.cpp	(revision 8005)
+++ gm/gmmain.cpp	(working copy)
@@ -1178,7 +1178,9 @@
     bool doRTree = true;
     bool doTileGrid = true;
     bool doVerbose = false;
+#if SK_SUPPORT_GPU
     bool disableTextureCache = false;
+#endif
     SkTDArray<size_t> configs;
     SkTDArray<size_t> excludeConfigs;
     SkTDArray<SkScalar> tileGridReplayScales;
@@ -1315,7 +1317,9 @@
         } else if (strcmp(*argv, "--noserialize") == 0) {
             doSerialize = false;
         } else if (strcmp(*argv, "--notexturecache") == 0) {
+#if SK_SUPPORT_GPU
             disableTextureCache = true;
+#endif
         } else if (strcmp(*argv, "--tiledPipe") == 0) {
             doTiledPipe = true;
         } else if (!strcmp(*argv, "--verbose") || !strcmp(*argv, "-v")) {