Added support for Solaris style lockf. Rev: src/configure.in:1.189 Rev: src/fdlib.h:1.15 Rev: src/modules/files/file.c:1.98 Rev: src/modules/files/file.h:1.11 Rev: src/modules/files/file_functions.h:1.3 Rev: src/modules/files/testsuite.in:1.18