Use the new build system in XCode 10

[alexsegura]

To be able to compile the latest version, we had to switch to using the Legacy Build System (both in XCode & Travis)

CHANGES

coopcycle-app/ios/CoopCycle.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

Lines 4 to 7 in 262cff4

	<dict>
	<key>BuildSystemType</key>
	<string>Original</string>
	</dict>

coopcycle-app/.travis.yml

Lines 50 to 51 in 262cff4

	script:
	- xcodebuild -workspace CoopCycle.xcworkspace -scheme CoopCycle -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO -quiet -UseModernBuildSystem=NO | xcpretty && exit ${PIPESTATUS[0]}

---

We should be able to use the new build system.

See facebook/react-native#20492

Example Travis build showing the error → https://travis-ci.org/coopcycle/coopcycle-app/jobs/511394418

[alexsegura]

Fixed in c5c3dd1

[alexsegura]

Actually, it doesn't work... still getting "Multiple commands produce error"