Updating Gnulib to commit 78f00bd0af9a940d40decad6099b828e08aa91d1
We need to include absolute-header.m4 everywhere

Addressing:
checking for complete errno.h... yes
./configure: line 7133: syntax error near unexpected token `errno.h'
./configure: line 7133: `           gl_ABSOLUTE_HEADER_ONE(errno.h)'