Make ab.c again pass ``gcc -Wall -Wshadow -Wpointer-arith -Wcast-align

-Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Winline''
without complains after we recently added the POST feature.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81958 13f79535-47bb-0310-9956-ffa450edef68