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Fix for regexp memory leak.

I have found a fix for the regexp memory leak. In the file regex-posix.c
the routine scm_regexp_exec mallocs memory for a match structure at line
242, which is never freed. Inserting the line 

 scm_must_free ( (char *)matches);

before SCM_ALLOW_INTS fixes the problem. Thank you to roland for his help.

Julian Satchell
<satchell@dera.gov.uk>