mongodb: switch to vendored boost version

srcpkgs/mongodb/template

@@ -1,10 +1,10 @@
 # Template file for 'mongodb'
 pkgname=mongodb
 version=3.4.17
-revision=1
+revision=2
 wrksrc="mongodb-src-r${version}"
 hostmakedepends="scons"
-makedepends="boost-devel pcre-devel snappy-devel libressl-devel libpcap-devel
+makedepends="pcre-devel snappy-devel libressl-devel libpcap-devel
  gperftools libsasl-devel yaml-cpp-devel"
 depends="cyrus-sasl-modules"
 conf_files="/etc/mongodb/mongodb.conf"
@@ -57,7 +57,6 @@ do_build() {
 		CPPPATH="${XBPS_CROSS_BASE}/usr/include" \
 		--prefix="/usr" \
 		--use-system-pcre \
-		--use-system-boost \
 		--use-system-snappy \
 		--use-system-zlib \
 		--use-system-yaml \