File csound-alsa-fix.diff of Package csound.463

--- InOut/rtalsa.c-dist	2007-01-22 11:31:00.000000000 +0100
+++ InOut/rtalsa.c	2007-01-22 11:31:28.000000000 +0100
@@ -27,6 +27,9 @@
 #ifndef _POSIX_SOURCE
 #define _POSIX_SOURCE 1
 #endif
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 1
+#endif
 #ifndef _BSD_SOURCE
 #define _BSD_SOURCE 1
 #endif