[BUGFIX] Prevent race conditions in EEL Expression Cache
[BUGFIX] Prevent race conditions in EEL Expression Cache

This should prevent race conditions where the included cache
file contained less expressions than the file that ends up in
the code to be cached string.

Change-Id: Ib39d7b96f4c5833a304cfc12c5dc7b3c5f53ec21
Releases: master, 2.1
Reviewed-on: https://review.typo3.org/26382
Reviewed-by: Christian Mueller
Tested-by: Christian Mueller
Original-Commit-Hash: e30a9e7cf65fe4a260121900024157733b8dc6f6

dfeyer/flow-development-collection,dlubitz/flow-development-collection,kdambekalns/flow-development-collection,daniellienert/flow-development-collection,daniellienert/flow-development-collection,neos/flow-development-collection,fcool/flow-development-collection,dfeyer/flow-development-collection,albe/flow-development-collection,robertlemke/flow-development-collection,daniellienert/flow-development-collection,mkeitsch/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,robertlemke/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,chewbakartik/flow-development-collection,bwaidelich/flow-development-collection,fcool/flow-development-collection,gerhard-boden/flow-development-collection,robertlemke/flow-development-collection,gerhard-boden/flow-development-collection,chewbakartik/flow-development-collection,gerhard-boden/flow-development-collection,dlubitz/flow-development-collection,kitsunet/flow-development-collection,dlubitz/flow-development-collection,mkeitsch/flow-development-collection,aertmann/flow-development-collection,aertmann/flow-development-collection,bwaidelich/flow-development-collection,kitsunet/flow-development-collection,aertmann/flow-development-collection,dfeyer/flow-development-collection,kitsunet/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,kdambekalns/flow-development-collection,mkeitsch/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,albe/flow-development-collection,neos/flow-development-collection