Whenever we build without `make clean` first, this file gets
overwritten. It asks the user for input because it is not run with
`-f`. This causes the build to hang until the user inputs `y`.
Here is an example build:
```
$ make -j7 && sudo make install
CC: cc -DCLN_NEXT_VERSION="v24.08" -DPKGLIBEXECDIR="/usr/local/libexec/c-lightning" -DBINDIR="/usr/local/bin" -DPLUGINDIR="/usr/local/libexec/c-lightning/plugins" -DCCAN_TAL_NEVER_RETURN_NULL=1 -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition -Werror -Wno-maybe-uninitialized -Wshadow=local -std=gnu11 -g -fstack-protector-strong -Og -I ccan -I external/libwally-core/include/ -I external/libwally-core/src/secp256k1/include/ -I external/jsmn/ -I external/libbacktrace/ -I external/gheap/ -I external/build-x86_64-linux-gnu/libbacktrace-build -I external/libsodium/src/libsodium/include -I external/libsodium/src/libsodium/include/sodium -I external/build-x86_64-linux-gnu/libsodium-build/src/libsodium/include -I . -I/usr/local/include -I/usr/include/postgresql -DSHACHAIN_BITS=48 -DJSMN_PARENT_LINKS -DCOMPAT_V052=1 -DCOMPAT_V060=1 -DCOMPAT_V061=1 -DCOMPAT_V062=1 -DCOMPAT_V070=1 -DCOMPAT_V072=1 -DCOMPAT_V073=1 -DCOMPAT_V080=1 -DCOMPAT_V081=1 -DCOMPAT_V082=1 -DCOMPAT_V090=1 -DCOMPAT_V0100=1 -DCOMPAT_V0121=1 -c -o
LD: cc -Og config.vars -Lexternal/build-x86_64-linux-gnu -lwallycore -lsecp256k1 -ljsmn -lbacktrace -lsodium -L/usr/local/include -lm -lsqlite3 -L/usr/lib/x86_64-linux-gnu -lpq -o
mv: replace 'tools/headerversions', overriding mode 0755 (rwxr-xr-x)? cc lightningd/test/run-check_node_announcement.c
cc lightningd/test/run-find_my_abspath.c
cc lightningd/test/run-invoice-select-inchan.c
cc lightningd/test/run-jsonrpc.c
cc lightningd/test/run-log_filter.c
cc lightningd/test/run-log-pruning.c
cc lightningd/test/run-shuffle_fds.c
ld lightningd/test/run-find_my_abspath
ld lightningd/test/run-log-pruning
ld lightningd/test/run-check_node_announcement
ld lightningd/test/run-log_filter
ld lightningd/test/run-jsonrpc
ld lightningd/test/run-shuffle_fds
ld lightningd/test/run-invoice-select-inchan
^Cmake: *** [tools/Makefile:16: tools/headerversions] Interrupt
```
One workaround is to just know that you need to enter `y` here.
But the best solution is probably to update the Makefile like so.
Changelog-None
c7189f644a