Initial android support (#17)

* Upload Android armv7 libs

* Fix debug build

* utlvector: fix undefined behavior

* wscript: add --use-ccache option

* wscript: store ccache in a separate directory

* Propertly use gl4es

* fontconfig: fix font detection

* [android]remove fontconfig dependency

* Add build guide for other platforms

Co-authored-by: JusicP <slender87844@gmail.com>
Co-authored-by: nillerusr <nillerusr@users.noreply.github.com>

tier0/platform_posix.cpp

@@ -28,6 +28,9 @@
 #include <time.h>
 #include <fcntl.h>
 #endif
+#ifdef ANDROID
+#include <linux/stat.h>
+#endif
 
 #include "tier0/memdbgon.h"
 // Benchmark mode uses this heavy-handed method