patch 8.1.1290: .hgignore and .gitignore are either distributed or in git

Problem:    .hgignore and .gitignore are either distributed or in git, not
            both.
Solution:   Add .gitignore to the distribution and .hgignore to git.  Update
            the entries. (Christian Brabandt, Ken Takata)

.hgignore

@@ -0,0 +1,104 @@
+syntax: glob
+
+# Unixen: object and executable files.
+*.o
+src/vim
+src/xxd/xxd
+src/auto/if_perl.c
+src/auto/gui_gtk_gresources.c
+src/auto/gui_gtk_gresources.h
+src/objects/.dirstamp
+src/objects
+src/tags
+
+# We do need src/auto/configure.
+src/auto/config.cache
+src/auto/config.h
+src/auto/config.log
+src/auto/config.mk
+src/auto/config.status
+src/auto/osdef.h
+src/auto/link.log
+src/auto/link.sed
+src/auto/pathdef.c
+
+# Windows
+*.exe
+*.idb
+*.manifest
+*.exp
+*.map
+*.obj
+*.pdb
+*.ilk
+*.sln
+*.suo
+*.res
+*.RES
+vim*.dll
+vim*.lib
+src/pathdef.c
+src/Obj*/pathdef.c
+gvimext.dll
+gvimext.lib
+gvim.lib
+runtime/doc/uganda.nsis.txt
+nsis/icons/*
+
+# Borland C++
+bcc.cfg
+*.ilc
+*.ild
+*.ilf
+*.ils
+*.tds
+
+# NetBeans
+nbproject/*
+
+# Mac OSX
+src/xxd/xxd.dSYM
+
+# All platforms
+*.rej
+*.orig
+*.mo
+*.swp
+*~
+*.pyc
+*.log
+src/po/vim.pot
+
+# Generated by "make test"
+src/po/*.ck
+src/po/*.desktop
+src/testdir/mbyte.vim
+src/testdir/mzscheme.vim
+src/testdir/lua.vim
+src/testdir/small.vim
+src/testdir/tiny.vim
+src/testdir/test*.out
+src/testdir/test*.failed
+src/testdir/test.log
+src/testdir/dostmp/*
+src/testdir/messages
+src/testdir/viminfo
+src/testdir/opt_test.vim
+runtime/indent/testdir/*.out
+src/memfile_test
+src/json_test
+src/message_test
+src/kword_test
+
+# Generated by "make install"
+runtime/doc/tags
+
+# Generated by "make shadow".  The directory names could be anything but we
+# restrict them to shadow (the default) or shadow-*
+src/shadow
+src/shadow-*
+src/runtime
+src/pixmaps
+
+# other possible files build by tools
+src/cscope.out