please fix heap_init

[jojelino <jojelino at gmail dot com>]

this is following of 'infinite recursion in git-svn'
#to reproduce this problem,
#1. please use latest cvs trunk
#2. set HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\heap_chunk_in_mb=0x400
Starting program: /usr/bin/perl.exe /usr/lib/git-core/git-svn clone 
-rHEAD http://google-perftools.googlecode.com/svn/trunk/
[New Thread 5352.0x9c4]
warning: section .gnu_debuglink not found in 
/cygdrive/d/cygwin/bin/cygwin1.dbg

Breakpoint 1, heap_init () at /tmp/winsup/winsup/cygwin/heap.cc:81
81                    start_address = roundup2 (start_address + 
mbi.RegionSize,
2: largest_found_size = 0x35680000
1: start_address = 0x55690000
(gdb) i b
Num     Type           Disp Enb Address    What
1       breakpoint     keep y   0x61078875 in heap_init()
                                           at 
/tmp/winsup/winsup/cygwin/heap.cc:81
        breakpoint already hit 1 time
(gdb)

start_address continues to grow, and in heap.cc:94 it is used as base 
address.
which is not we wanted. and sbrk could fail if it used up MINHEAP_SIZE.

please fix this problem
Regards



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