Remove -lpthread and -ldl from ldflags

There is no need in those flags now when we use amalgamated sqlite3 from
mattn/go-sqlite3.

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
Upstream-commit: 8845eb434596ea709a7ef066d191141331dd1098
Component: engine

components/engine/hack/make.sh

@@ -150,12 +150,9 @@ BUILDFLAGS=( $BUILDFLAGS "${ORIG_BUILDFLAGS[@]}" )
 : ${TIMEOUT:=60m}
 TESTFLAGS+=" -test.timeout=${TIMEOUT}"
 
-# A few more flags that are specific just to building a completely-static binary (see hack/make/binary)
-# PLEASE do not use these anywhere else.
-EXTLDFLAGS_STATIC_DOCKER="$EXTLDFLAGS_STATIC -lpthread -ldl"
 LDFLAGS_STATIC_DOCKER="
 	$LDFLAGS_STATIC
-	-extldflags \"$EXTLDFLAGS_STATIC_DOCKER\"
+	-extldflags \"$EXTLDFLAGS_STATIC\"
 "
 
 if [ "$(uname -s)" = 'FreeBSD' ]; then