made it possible to compile modules outside of source tree

Rev: src/Makefile.in:1.117
Rev: src/aclocal.m4:1.1
Rev: src/modules/Gdbm/configure.in:1.3
Rev: src/modules/Gmp/configure.in:1.4
Rev: src/modules/Gz/configure.in:1.12
Rev: src/modules/Image/configure.in:1.9
Rev: src/modules/Image/encodings/configure.in:1.5
Rev: src/modules/MIME/configure.in:1.4
Rev: src/modules/Msql/configure.in:1.4
Rev: src/modules/Mysql/configure.in:1.6
Rev: src/modules/Odbc/configure.in:1.11
Rev: src/modules/Oracle/configure.in:1.12
Rev: src/modules/Pipe/configure.in:1.6
Rev: src/modules/Postgres/configure.in:1.8
Rev: src/modules/Regexp/configure.in:1.6
Rev: src/modules/Ssleay/configure.in:1.5
Rev: src/modules/Yp/configure.in:1.8
Rev: src/modules/_Crypto/configure.in:1.6
Rev: src/modules/_Image_JPEG/configure.in:1.4
Rev: src/modules/_Image_XFace/configure.in:1.3
Rev: src/modules/call_out/configure.in:1.6
Rev: src/modules/dynamic_module_makefile.in:1.44
Rev: src/modules/files/configure.in:1.59
Rev: src/modules/math/configure.in:1.7
Rev: src/modules/readline/configure.in:1.4
Rev: src/modules/spider/configure.in:1.24
Rev: src/modules/sprintf/configure.in:1.5
Rev: src/modules/static_module_makefile.in:1.37
Rev: src/modules/system/configure.in:1.28
Rev: src/pike-module.in:1.1
Rev: src/run_autoconfig:1.23