Updated mercurial packages fix security vulnerabilities

This update provides mercurial version 4.6.2 and fixes the following security issues: Fix the mpatch_apply function in mpatch.c that incorrectly proceeds in cases where the fragment start is past the end of the original data (CVE-2018-13346). Fix mpatch.c that mishandles integer addition and subtraction (CVE-2018-13347). Fix the mpatch_decode function in mpatch.c that mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data (CVE-2018-13348). Remote attackers may bypass HTTP server permissions via batch wire protocol commands(CVE-2018-1000132).