pppd: only install manpages if BR2_HAVE_MANPAGES is enabled

They do get removed in target-finalize, but we might as well not install
them in the first place.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -6,7 +6,7 @@
 	X.org updated to 7.5.
 
 	Updated/fixed packages: busybox, dosfstools, e2fsprogs,
-	libglib2, libpng, mtd-utils, setserial, squashfs
+	libglib2, libpng, mtd-utils, pppd, setserial, squashfs
 
 	Issues resolved (http://bugs.uclibc.org):
 

package/pppd/pppd.mk

@@ -8,7 +8,7 @@ PPPD_VERSION = 2.4.5
 PPPD_SOURCE = ppp-$(PPPD_VERSION).tar.gz
 PPPD_SITE = ftp://ftp.samba.org/pub/ppp
 PPPD_TARGET_BINS = chat pppd pppdump pppstats
-PPPD_MANPAGES = chat pppd pppdump pppstats
+PPPD_MANPAGES = $(if $(BR2_HAVE_MANPAGES),chat pppd pppdump pppstats)
 PPPD_MAKE = $(MAKE) CC=$(TARGET_CC) COPTS="$(TARGET_CFLAGS)" -C $(PPPD_DIR) $(PPPD_MAKE_OPT)
 
 ifeq ($(BR2_PACKAGE_PPPD_FILTER),y)