cache: Fix performance problem with large numbers of source files

Some companies are using large numbers of patch files in SRC_URI.
Rightly or wrongly that exposes a performance problem where the code
does not handle the large string manipulations in a way which works
efficienty in python.

This is a modified version of a patch from z00539568
<zhangyifan46@huawei.com153340508@qq.com which addresses the performance
problem. I modified it to use a more advanced regex, retain the "*" check
and cache the regex.

[YOCTO #13824]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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