gmon: Various bug fixes (#2180155)

Change sgetsgent_r to set errno. (#2172949)

Fix incorrect inline feraiseexcept on i686, x86-64 (#2183081)

Enforce a specififc internal ordering for tunables (#2154914)

Fix rtld-audit trampoline for aarch64 (#2144568)

Backport upstream fixes to tst-pldd (#2142937)

Switch to fast DSO dependency sorting algorithm (#1159809)

Explicitly switch to --with-default-link=no (#2109510)
Define MAP_SYNC on ppc64le (#2139875)

Fix -Wstrict-overflow warning when using CMSG_NXTHDR macro (#2116938)

Fix dlmopen/dlclose/dlmopen sequence and libc initialization (#2121746)

Fix memory corruption in printf with thousands separators and large

Retain .gnu_debuglink section for libc.so.6 (#2115830)
Remove redundant ld.so debuginfo file

Improve malloc implementation (#1871383)

Fix hwcaps search path size computation (#2125222)

Fix nscd netlink cache invalidation if epoll is used (#2122498)