define _GNU_SOURCE to resolve implicit declaration of vasprintf #136
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This resolves resolve implict declaration error
xmalloc.c: In function ‘xasprintf’:
xmalloc.c:114:13: error: implicit declaration of function ‘vasprintf’; did you mean ‘xasprintf’? [-Werror=implicit-function-declaration]
114 | i = vasprintf(ret, fmt, ap);
| ^~~~~~~~~
| xasprintf
_GNU_SOURCE macro enables vasprintf function declaration.
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This MR resolves the following implicit declaration warning (#137):
Debian unstable build succeeds after applying #135 and this PR.