Kill bashizm

'=' operator for test(1) is not portable.
Merge branch 'hotfix-kill-bashism-2nd' into release-1.4
Update NEWS
Update ChangeLog
Bump version
Merge branch 'develop' into release-1.4
Checks the availability of some C compiler warning flags
Merge branch 'hotfix-test-compiler-flags' into release-1.4
Merge branch 'fix-for-no-long-option-build' into release-1.4
Merge branch 'develop' into release-1.4
Build fix for Interix
Merge branch 'release-1.4' into hotfix-portable-strdup