package/lighttpd: add xxhash mandatory dependency

Add xxhash mandatory dependency to avoid the following build failure
with the embedded xxhash (in version 0.8.1) and uclibc raised since
bump to version 1.4.63 in commit
2a002466459a17f44f565209a9cfd8512676ca47 and
https://github.com/lighttpd/lighttpd1.4/commit/23b07fa3efde70b76afa5380b1602d0515aedd46:

/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/arm-buildroot-linux-uclibcgnueabi/10.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: src/lighttpd.p/algo_xxhash.c.o: in function `XXH32_canonicalFromHash':
/home/buildroot/autobuild/instance-0/output-1/build/lighttpd-1.4.63/build/../src/algo_xxhash.h:2282: undefined reference to `static_assert'

Fixes:
 - http://autobuild.buildroot.org/results/7b644dce244a1aa4a193a3196059a56b2c4c7591

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/lighttpd/Config.in

@@ -6,6 +6,7 @@ config BR2_PACKAGE_LIGHTTPD
 	bool "lighttpd"
 	depends on BR2_USE_MMU # fork()
 	depends on !BR2_STATIC_LIBS
+	select BR2_PACKAGE_XXHASH
 	help
 	  lighttpd a secure, fast, compliant and very flexible
 	  web-server which has been optimized for high-performance

package/lighttpd/lighttpd.mk

@@ -11,7 +11,7 @@ LIGHTTPD_SITE = http://download.lighttpd.net/lighttpd/releases-$(LIGHTTPD_VERSIO
 LIGHTTPD_LICENSE = BSD-3-Clause
 LIGHTTPD_LICENSE_FILES = COPYING
 LIGHTTPD_CPE_ID_VENDOR = lighttpd
-LIGHTTPD_DEPENDENCIES = host-pkgconf
+LIGHTTPD_DEPENDENCIES = host-pkgconf xxhash
 LIGHTTPD_CONF_OPTS = \
 	-Dwith_brotli=false \
 	-Dwith_dbi=false \
@@ -33,7 +33,7 @@ LIGHTTPD_CONF_OPTS = \
 	-Dwith_sasl=false \
 	-Dwith_wolfssl=false \
 	-Dwith_xattr=false \
-	-Dwith_xxhash=false \
+	-Dwith_xxhash=true \
 	-Dwith_zstd=false \
 	-Dbuild_extra_warnings=false \
 	-Dbuild_static=false \