SECTORDER_FLAGS should be defined in target's xcconfig file, not Base.xcconfig

SECTORDER_FLAGS should be defined in target's xcconfig file, not Base.xcconfig
<http://webkit.org/b/135006>

Reviewed by Darin Adler.

Source/JavaScriptCore:
* Configurations/Base.xcconfig: Move SECTORDER_FLAGS to
JavaScriptCore.xcconfig.
* Configurations/CompileRuntimeToLLVMIR.xcconfig: Remove empty
SECTORDER_FLAGS definition.
* Configurations/DebugRelease.xcconfig: Ditto.
* Configurations/JavaScriptCore.xcconfig: Use $(CONFIGURATION)
so SECTORDER_FLAGS is only set on Production builds.

Source/WebCore:
* Configurations/Base.xcconfig: Move SECTORDER_FLAGS to
WebCore.xcconfig.
* Configurations/DebugRelease.xcconfig: Remove empty
SECTORDER_FLAGS definition.
* Configurations/WebCoreTestShim.xcconfig: Ditto.
* Configurations/WebCoreTestSupport.xcconfig: Ditto.
* Configurations/WebCore.xcconfig: Use $(CONFIGURATION) so
SECTORDER_FLAGS is only set on Production builds.

Source/WebKit:
* WebKit.xcodeproj/project.pbxproj: Remove references to unused
WebKit.xcconfig file.

Source/WebKit/mac:
* Configurations/Base.xcconfig: Move SECTORDER_FLAGS to
WebKitLegacy.xcconfig.
* Configurations/DebugRelease.xcconfig: Remove empty
SECTORDER_FLAGS definition.
* Configurations/WebKit.xcconfig: Removed.  Unused.
* Configurations/WebKitLegacy.xcconfig: Use $(CONFIGURATION) so
SECTORDER_FLAGS is only set on Production builds.

Source/WebKit2:
* Configurations/Base.xcconfig: Move SECTORDER_FLAGS to
WebKit.xcconfig.
* Configurations/DebugRelease.xcconfig: Remove empty
SECTORDER_FLAGS definition.
* Configurations/WebKit.xcconfig: Use $(CONFIGURATION) so
SECTORDER_FLAGS is only set on Production builds.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@171212 268f45cc-cd09-0410-ab3c-d52691b4dbfc