Fix a rare case where our use of 'make' would fail or yield bogus

results if Configure was called from a Makefile shell. Default to 'make'
if MAKE is not in the enviroment.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82456 13f79535-47bb-0310-9956-ffa450edef68