make: add the manual page

*** 328,337 ****
--- 328,338 ----
          /usr/share/man \
          /usr/share/man/man1 \
          /usr/share/man/man1b \
          /usr/share/man/man1c \
          /usr/share/man/man1m \
+         /usr/share/man/man1s \
          /usr/share/man/man2 \
          /usr/share/man/man3 \
          /usr/share/man/man3bsm \
          /usr/share/man/man3c \
          /usr/share/man/man3c_db \