pcs: Give MSP a bit of head room for ADAM_USER size

Turns out that this code is unsafe and tries to sprintf ADAM_USER
into a small fixed-size buffer without any checks. Increase the
buffer to 1024 characters for now but some proper checks are needed.

libraries/pcs/msp/msp.c

@@ -106,7 +106,7 @@
 #define MSP__LOCAL -2
 #define MSP__EXTERNAL -3
 
-#define MAXPATH 100
+#define MAXPATH 1024
 
 /* Older systems do not declare socklen_t */
 #if !HAVE_SOCKLEN_T