Dockerfile: install libgcc instead of gcc

The comment describes we need gcc for libgcc only, so we may
as well install that.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -22,7 +22,7 @@ WORKDIR /go/src/github.com/docker/cli
 FROM build-base-alpine AS build-alpine
 ARG TARGETPLATFORM
 # gcc is installed for libgcc only
-RUN xx-apk add --no-cache musl-dev gcc
+RUN xx-apk add --no-cache musl-dev libgcc
 
 FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-${BASE_DEBIAN_DISTRO} AS build-base-debian
 ENV GOTOOLCHAIN=local