Re-enable netdb tests, fix compiler warning, improve brk coverage

7 jobs for fix-test in 7 minutes and 12 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #24425
build:linux

00:06:07

failed #24437
build:redox

00:01:04

failed #24436
build:redox

00:01:36

failed #24426
build:redox

00:05:53

 
  Test
skipped #24429
allowed to fail
fmt
skipped #24427
test:linux
skipped #24428
test:redox
 
Name Stage Failure
failed
build:redox Build

error: aborting due to 4 previous errors

error: Could not compile `relibc`.

To learn more, run the command again with --verbose.
Makefile:142: recipe for target '"target/x86_64-unknown-redox"/release/librelibc.a' failed
make: *** ["target/x86_64-unknown-redox"/release/librelibc.a] Error 101
ERROR: Job failed: exit code 1