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remi-parain <rparain@ubidreams.com> in Errai

"maven-war-plugin" dependency should not be mandatory. The build should not crash if the dependency is missing.

Signed-off-by: remi-parain <rparain@ubidreams.com>

$platform should be lowercase to avoid FileNotFoundException

Without this fix, the process crash on Linux while working fine on OSX

Signed-off-by: remi-parain <rparain@ubidreams.com>