Now sets CONFIG_HEADERS.

Rev: src/modules/Gdbm/Makefile.in:1.4
Rev: src/modules/Gz/Makefile.in:1.4
Rev: src/modules/Image/Makefile.in:1.22
Rev: src/modules/Java/Makefile.in:1.3
Rev: src/modules/MIME/Makefile.in:1.3
Rev: src/modules/Msql/Makefile.in:1.4
Rev: src/modules/Mysql/Makefile.in:1.4
Rev: src/modules/Odbc/Makefile.in:1.3
Rev: src/modules/Oracle/Makefile.in:1.2
Rev: src/modules/Parser/Makefile.in:1.2
Rev: src/modules/Perl/Makefile.in:1.3
Rev: src/modules/Pipe/Makefile.in:1.4
Rev: src/modules/Postgres/Makefile.in:1.4
Rev: src/modules/Regexp/Makefile.in:1.6
Rev: src/modules/Ssleay/Makefile.in:1.4
Rev: src/modules/Yp/Makefile.in:1.4
Rev: src/modules/_Charset/Makefile.in:1.3
Rev: src/modules/_Crypto/Makefile.in:1.18
Rev: src/modules/_Image_JPEG/Makefile.in:1.3
Rev: src/modules/_Image_TIFF/Makefile.in:1.2
Rev: src/modules/_Image_TTF/Makefile.in:1.2
Rev: src/modules/_Image_XFace/Makefile.in:1.3
Rev: src/modules/_math/Makefile.in:1.6
Rev: src/modules/call_out/Makefile.in:1.7
Rev: src/modules/files/Makefile.in:1.9
Rev: src/modules/spider/Makefile.in:1.17
Rev: src/modules/sprintf/Makefile.in:1.7
Rev: src/modules/system/Makefile.in:1.8