Fix building audio_standalone example on linux

Signed-off-by: Saggi Mizrahi <saggi@mizrahi.cc>

examples/audio_standalone.c

@@ -24,10 +24,52 @@
 ********************************************************************************************/
 
 #include <stdio.h>
+#if defined(_WIN32)
 #include <conio.h>      // Windows only, no stardard library
-
+#endif
 #include "audio.h"
 
+#if defined(__linux)
+
+#include <stdio.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static int kbhit(void)
+{
+	struct termios oldt, newt;
+	int ch;
+	int oldf;
+
+	tcgetattr(STDIN_FILENO, &oldt);
+	newt = oldt;
+	newt.c_lflag &= ~(ICANON | ECHO);
+	tcsetattr(STDIN_FILENO, TCSANOW, &newt);
+	oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
+	fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
+
+	ch = getchar();
+
+	tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
+	fcntl(STDIN_FILENO, F_SETFL, oldf);
+
+	if(ch != EOF)
+	{
+		ungetc(ch, stdin);
+		return 1;
+	}
+
+	return 0;
+}
+
+static char getch()
+{
+	return getchar();
+}
+
+#endif
+
 #define KEY_ESCAPE  27
 
 int main()
@@ -78,4 +120,4 @@ int main()
     //--------------------------------------------------------------------------------------
 
     return 0;
-}
+}