The JavaScriptCore.dll is missing the version information specified in the sources. This patch corrects the missing step needed to seed the version resource for the build.
<rdar://problem/18075852>
It looks like the JavaScriptCorePreBuild.cmd is missing a call to auto-version.pl to seed the JSC-specific build directory with the version information.
Created attachment 236881 [details] Patch
Committed r172805: <http://trac.webkit.org/changeset/172805>