[cmake-developers] PATCH: add subcommand string(APPEND)

[Daniel Pfeifer]

Attached is a patch that adds a subcommand string(APPEND).
This allows to write

> string(APPEND string_variable "some string")

instead of

> set(string_variable "${string_variable}some string")

Two other patches make use of this subcommand. The changes have been
created with

> find Modules -type f -print0 | xargs -0 perl -i -0pe \
> 's/set\(([a-zA-Z0-9_]+)(\s+)"\$\{\1\}([^"])/string(APPEND \1\2"\3/g'

cheers, Daniel
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