Use CMake's Android generators to crosscompile

src/OSSupport/StackTrace.cpp

@@ -7,7 +7,7 @@
 #include "StackTrace.h"
 #ifdef _WIN32
 	#include "../StackWalker.h"
-#else
+#elif !defined(ANDROID)  // The Android NDK has no execinfo header
 	#ifdef __GLIBC__
 		#include <execinfo.h>
 	#endif
@@ -32,7 +32,7 @@ void PrintStackTrace(void)
 			}
 		} sw;
 		sw.ShowCallstack();
-	#else
+	#elif !defined(ANDROID)
 		#ifdef __GLIBC__
 			// Use the backtrace() function to get and output the stackTrace:
 			// Code adapted from https://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes