Fix the following bunch of warnings in dexter MPM:

egcc -c  -I../../../os/unix -I../../../include -I../../../modules/mpm/dexter
-pipe -O2 -pedantic -Wall -Wshadow -Wpointer-arith -Wcast-align
-Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Winline
-Wno-long-long -funsigned-char -DTARGET=\"apache\" -DUSE_EXPAT
-I../../../lib/expat-lite `../../../apaci` dexter.c
dexter.c:188: warning: no previous prototype for `clean_child_exit'
dexter.c:491: warning: no previous prototype for `ap_start_shutdown'
dexter.c:504: warning: no previous prototype for `ap_start_restart'
dexter.c:682: warning: declaration of `pconf' shadows global declaration
dexter.c: In function `setup_listeners':
dexter.c:683: warning: declaration of `pconf' shadows global declaration
dexter.c: In function `process_socket':
dexter.c:744: warning: pointer targets in passing arg 3 of `getsockname'
differ in signedness
dexter.c: In function `worker_thread':
dexter.c:932: warning: pointer targets in passing arg 3 of `accept' differ in
signedness
dexter.c: In function `ap_mpm_run':
dexter.c:1365: warning: declaration of `i' shadows previous local
dexter.c: At top level:
dexter.c:1404: warning: declaration of `pconf' shadows global declaration
dexter.c: In function `dexter_pre_config':
dexter.c:1405: warning: declaration of `pconf' shadows global declaration


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83837 13f79535-47bb-0310-9956-ffa450edef68