scripts/build/binary: disable pkcs11 on static builds with CGO_ENABLED=1

pkcs11 cannot be compiled statically if CGO is enabled (and glibc is used)
see https://github.com/docker/cli/blob/3897c3fa544f1239c2bc2c3af2adcebcb3650c4d/vendor/github.com/miekg/pkcs11/pkcs11.go#L75
see #3490 (comment)

When trying to do otherwise, warnings are printed (and shouldn't be ignored,
similar to the `osusergo` build-tag):

    #32 [linux/amd64->s390x build 2/2] RUN --mount=type=bind,target=.,ro     --mount=type=cache,target=/root/.cache     --mount=from=dockercore/golang-cross:xx-sdk-extras,target=/xx-sdk,src=/xx-sdk     --mount=type=tmpfs,target=cli/winresources     xx-go --wrap &&     TARGET=/out ./scripts/build/binary &&     xx-verify $([ "static" = "static" ] && echo "--static") /out/docker
    #32 467.0 # github.com/docker/cli/cmd/docker
    #32 467.0 /usr/bin/s390x-linux-gnu-ld: /tmp/go-link-900380651/000018.o: in function `New':
    #32 467.0 /go/src/github.com/docker/cli/vendor/github.com/miekg/pkcs11/pkcs11.go:75: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
    #32 467.0 /usr/bin/s390x-linux-gnu-ld: /tmp/go-link-900380651/000004.o: in function `_cgo_26061493d47f_C2func_getaddrinfo':
    #32 467.0 /tmp/go-build/cgo-gcc-prolog:58: warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

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

scripts/build/binary

@@ -7,7 +7,10 @@ set -eu
 
 . ./scripts/build/.variables
 
-if [ "$CGO_ENABLED" = "1" ] && [ "$(go env GOOS)" != "windows" ]; then
+if [ "$CGO_ENABLED" = "1" ] && [ "$(go env GOOS)" != "windows" ] && [ "$GO_LINKMODE" != "static" ]; then
+  # pkcs11 cannot be compiled statically if CGO is enabled (and glibc is used)
+  # see https://github.com/docker/cli/blob/3897c3fa544f1239c2bc2c3af2adcebcb3650c4d/vendor/github.com/miekg/pkcs11/pkcs11.go#L75
+  # see https://github.com/docker/cli/pull/3490#issuecomment-1079711973
   GO_BUILDTAGS="$GO_BUILDTAGS pkcs11"
 fi