(mostly) pass "gcc -Wall -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align

-Wstrict-prototypes -Wnested-externs".  Notes:

- Full prototypes are good, they catch errors at compile time.

- Locals shadowing other locals or globals are bad, they cause errors
  inadvertantly (there once was a program with a global "int i;" ...).
  Even if the changes for this seem like gratuitous renaming, they're
  worth it in the long run.

- Nested-externs are bad because they override the (correct) declarations
  of externs that (should be) provided by header files.

- mod_rewrite isn't part of http_core and shouldn't be playing with the
  prelinked_modules variable.  It now uses find_linked_module instead.

- If an architecture doesn't use void (*)(int) as the prototypes for
  signal handlers we need to know, not cast it away.  Note that
  void restart(int sig) has been around for a while so it's unlikely
  this will cause problems.

- this is going to look huge as a context diff... I saved a unified if
  anyone wants to see it.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78716 13f79535-47bb-0310-9956-ffa450edef68