Fix memory leak when input contains illegal multibyte sequence, partially
taken from musl libc:
https://git.musl-libc.org/cgit/musl/commit/src/regex/regexec.c?id=546f6b322bcafa2452925c19f9607d9689c75

Fix memory leak when input contains illegal multibyte sequence, partially
taken from musl libc:
https://git.musl-libc.org/cgit/musl/commit/src/regex/regexec.c?id=546f6b322bcafa2452925c19f9607d9689c75f95

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Merge tre as of 20171117.

make this work:
- split alloca stuff in a separate file
- fix size_t/int/long inconsistencies
- fix weak alias stuff
- make paths consistent
- fix config files
- use switch instead of if/then/elseif.

make this work:
- split alloca stuff in a separate file
- fix size_t/int/long inconsistencies
- fix weak alias stuff
- make paths consistent
- fix config files
- use switch instead of if/then/elseif...
- fix Makefiles

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initial import of tre-0.8.0 into the external sources framework.

with many thanks to ville laurikari for writing tre in the first place
and for changing the licensing to a 2-clause bsd license; than

initial import of tre-0.8.0 into the external sources framework.

with many thanks to ville laurikari for writing tre in the first place
and for changing the licensing to a 2-clause bsd license; thanks also to
matthias-christian ott for his work on the google summer of code 2009
project.

this import brings the distribution to src/external - the reachover
build files will follow

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