Hi,

Currently, the generated gcore scripts assume the gdb binary they need 
to call is present in $PATH, but this may not always be true.

If you want to call the gcore scripts from a relative directory, for 
example, it will fail to locate the gdb binary. The attached patch fixes 
this.

Before the patch:

$ /tmp/gdb_test_install/bin/gcoreblahbleh 20000
/tmp/gdb_test_install/bin/gcoreblahbleh: 54: 
/tmp/gdb_test_install/bin/gcoreblahbleh: gdbblahbleh: not found
gcoreblahbleh: failed to create core.20000

After the patch:

$ /tmp/gdb_test_install/bin/gcoreblahbleh 20000
warning: unable to open /proc file '/proc/20000/status'
warning: unable to open /proc file '/proc/20000/status'
ptrace: No such process.
You can't do that without a process to debug.
The program is not being run.
gcoreblahbleh: failed to create core.20000

How does it look?

Regards,
Luis