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libc: increase default allocation for profiling

Current profiling size was 128k, and causes more frustration than it
is worth as demand paging makes this cheap.  Assuming 64 bytes at
worst per Plink this will use ~16M of virtual address space on 64bit
systems.

--- a/sys/man/1/prof

+++ b/sys/man/1/prof

@@ -77,7 +77,7 @@

 in

 .I program

 used to hold the profiling

-data, by default 2000 entries,

+data, by default 256k entries,

 may be controlled by setting the environment variable

 .B profsize

 before running

--- a/sys/src/libc/port/profile.c

+++ b/sys/src/libc/port/profile.c

@@ -240,7 +240,7 @@

 	char ename[50];

 	int n, f;

-	n = 2000;

+	n = 256*1024;

 	if (_tos->cyclefreq != 0LL){

 		khz = _tos->cyclefreq / 1000;	/* Report times in milliseconds */

 		havecycles = 1;