[release-branch.go1.3] include/u.h: define _DEFAULT_SOURCE for new glibc
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112530043 /
c8059ac4e0ec
include/u.h: define _DEFAULT_SOURCE for new glibc
glibc devs have apparently decided _BSD_SOURCE will be
deprecated on Linux, and issue a preprocessor warning if
declaring _BSD_SOURCE without _DEFAULT_SOURCE.
https://sourceware.org/glibc/wiki/Release/2.20
Fixes #8397.
LGTM=iant
R=dave, gobot, iant
CC=golang-codereviews
https://golang.org/cl/
112530043
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TBR=rsc
CC=golang-codereviews
https://golang.org/cl/
124150043