Removed old mercurial ignore file.

.hgignore

-/build/
-/build_.*/
-/build2/
-/build_clang/
-\.swp$
-\.swo$
-\.o$
-\.a$
-\.so$
-\.orig$
-\.obj$
-\.pyc$
-^build/
-^dist/
-^\.cache/
-^\.eggs/
-^dlib\.egg-info/
-^docs/release/
-^docs/docs/web/
-^docs/docs/chm/
-^docs/docs/cache/
-^docs/docs/log.txt$
-^docs/docs/old_log.txt$
-^dlib/test/debug.txt$
-^dlib/test/test$
-^dlib/test/makefile.bak$
-python_examples/.*.so$
-python_examples/.*.pyd$
-python_examples/.*.dll$
-python_examples/.*.lib$
-docs/docs/python/classes.txt
-docs/docs/python/functions.txt
-syntax: glob
-dlib/test/build64/*
-*.svm
-dlib/test/build_python
-dlib/test/test_log.txt
-dlib/test/build_vc2015_64/*
-dlib/test/build_vc2013_64/*
-dlib/test/build_vc2012_64/*
-dlib/java/libmyproject.so
-dlib/java/myproject.jar
-dlib/java/swig_test.class
-