Merge r14505 from trunk (Accept glibc 2.20 as valid.)


git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_10_BRANCH@14509 a5019735-40e9-0310-863c-91ae7b9d1cf9
Merge r14506 from trunk (valgrind-low-arm64.c: Fix missing break in switch)


git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_10_BRANCH@14510 a5019735-40e9-0310-863c-91ae7b9d1cf9
Merge r14507 from trunk (Handle gcc version 5.x.y.)


git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_10_BRANCH@14511 a5019735-40e9-0310-863c-91ae7b9d1cf9
Merge r14508 from trunk (Bug 338974 glibc 2.20 changed size of struct
sigaction sa_flags on s390)



git-svn-id: svn://svn.valgrind.org/valgrind/branches/VALGRIND_3_10_BRANCH@14512 a5019735-40e9-0310-863c-91ae7b9d1cf9