* procfs.h: New.
* proc-utils.h (procfs_first_available): Don't declare here.
* sol-thread.c: Include procfs.h instead of sys/procfs.h and
proc-utils.h.
* procfs.c: Include procfs.h.
(procfs_target): Make it public. Don't register
procfs_can_use_hw_breakpoint here.
(proc_set_watchpoint): Check for PCWATCH or PIOCSWATCH being
defined instead of TARGET_HAS_HARDWARE_WATCHPOINTS.
(procfs_can_use_hw_breakpoint): Remove check of
TARGET_HAS_HARDWARE_WATCHPOINTS.
(procfs_use_watchpoints): Register procfs_can_use_hw_breakpoint
here.
(_initialize_procfs): Don't add the procfs target here.
* i386-sol2-nat.c: Include target.h and procfs.h.
(_initialize_amd64_sol2_nat): Install the procfs target here,
customized with watchpoints support.
* irix5-nat.c: Include target.h.
(_initialize_core_irix5): Rename to ...
(_initialize_irix5_nat): ... this. Install the procfs target
here, customized with watchpoints support.
* alpha-nat.c: Include procfs.h.
(_initialize_core_alpha): Rename to...
(_initialize_alpha_nat): ... this. Install the procfs target
here, customized with watchpoints support.
* sparc-sol2-nat.c: Include target.h and procfs.h.
(_initialize_sparc_sol2_nat): New.