[Chicken-hackers] [PATCH] Fix _BSD_SOURCE warning when compiling with glibc >= 2.20

[Peder Refsnes]

When compiling any egg with chicken you get a deprecation warning:

/usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]

 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

On linux, `man feature_test_macros` state that the _BSD_SOURCE macro is

deprecated in glibc 2.20.

As suggested in the warning defining _DEFAULT_SOURCE makes the warning

go away.

0001-fixes-deprecation-warning-for-_BSD_SOURCE.patch
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