man: add symlinks for notmuch-restore.1 and notmuch-setup.1

These are just for the convenience of testers using $src/man as an
element of MANPATH. They are intentionally omitted from MAN1, so that
they do not interfere with the install.

diff --git a/man/man1/notmuch-restore.1 b/man/man1/notmuch-restore.1
new file mode 120000 (symlink)
index 0000000..b7a4d1b
--- /dev/null
+++ b/man/man1/notmuch-restore.1
@@ -0,0 +1 @@
+notmuch-dump.1
\ No newline at end of file

diff --git a/man/man1/notmuch-setup.1 b/man/man1/notmuch-setup.1
new file mode 120000 (symlink)
index 0000000..5c78dc8
--- /dev/null
+++ b/man/man1/notmuch-setup.1
@@ -0,0 +1 @@
+notmuch.1
\ No newline at end of file