configure.ac: properly detect vasprintf
According POSIX the va_list is defined in stdarg.h http://pubs.opengroup.org/onlinepubs/009695399/basedefs/stdarg.h.html On some systems (like uClibc) the detection of vasprintf will fail unless stdarg.h is included and build will later fail due to a vasprintf redeclaration. Signed-off-by: Natanael Copa <ncopa@alpinelinux.org> Signed-off-by: Rafaël Carré <funman@videolan.org> (cherry picked from commit 2859c5db3a74c5155e1715614570e9cb38d0ef82) Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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