man: improve install

Avoid using `ls` to get the file list as its behavior can be changed
by env vars.  Using shell globs instead should be much more stable.

Also check the exit value of the install command itself and abort if
we fail to install a man page.

man/Makefile

@@ -57,11 +57,10 @@ install:
 				else \
 					MAN_DIR=${BASEDIR}${mandir}/$$LANG/man$$SECTION; \
 				fi ; \
-				CMDS=`ls *.$$SECTION`; \
-				[ -z "$$CMDS" ] && continue; \
 				$(INSTALL) -d -m 755 $$MAN_DIR; \
-				for CMD in $$CMDS; do \
-					$(INSTALL) -m 644 $$CMD $$MAN_DIR; \
+				for CMD in *.$$SECTION; do \
+					[ -e $$CMD ] || continue; \
+					$(INSTALL) -m 644 $$CMD $$MAN_DIR || exit 1; \
 				done; \
 			done; \
 			cd ..; \