v2.7.4
Add symlink-safe system call replacements
maint: update all copyright year number ranges
Add line number overflow checking
Use symlink-safe system call replacements
build: update gnulib submodule to latest
patch: git-diff mode: do not change permissions if there isn't an explicit mode change.
Fix indentation heuristic for context diffs
Fail when out of memory in set_hunkmax()
Allow arbitrary symlink targets again
Update list of gnulib modules used
Move all source and header files into src/