bazel: is_dev_linux config setting should be false when cross_flag is

[srosenberg]

true

When cross-compiling on a gce worker and invoking bazel directly, build fails with "cannot find -lresolv_wrapper", owing to the fact that is_dev_linux is not mutually exclusive of cross_linux. That is, when both configs are active "-lresolv_wrapper" is passed to clinkopts in pkg/ccl/gssapiccl/BUILD.bazel; the cross-compiler doesn't have this lib nor does it need it.

Note, when using ./dev instead of bazel, the above issue is side-stepped because the dev wrapper invokes bazel inside docker which ignores ~/.bazelrc.

The workaround is to make is_dev_linux false when cross_flag is true.

Epic: none

Release note: None

[cockroach-teamcity]

This change is 

[srosenberg]

Running the following on a gce worker fails without this change,

bazel build //pkg/cmd/cockroach //pkg/compose/compare/compare:compare_test --config=ci --config=crosslinux --config=test

The reason is that ~/.bazelrc contains the line build --config=dev, which in conjunction with --config=crosslinux results in -lresolv_wrapper being passed to the cross-builder's linker,

/home/srosenberg/.cache/bazel/_bazel_srosenberg/3f1e38fca2391d213d04e1064a5fee62/external/toolchain_cross_x86_64-unknown-linux-gnu/bin/../lib/gcc/x86_64-unknown-linux-gnu/6.5.0/../../../../x86_64-unknown-linux-gnu/bin/ld.bfd: cannot find -lresolv_wrapper
collect2: error: ld returned 1 exit status
compilepkg: error running subcommand external/toolchain_cross_x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-gcc: exit status 1

[srosenberg]

bors r=rickystewart

[craig]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)