rust-config: add config getters that don't fall back to defaults
This is useful in cases where we access config items that are more... lenient
with their types than a fresh new system would allow.
For now there is only a single use of this, but we might get more later.
CC := gcc
CFLAGS := -g -O2 -Wall -Werror
prefix ?= /usr/bin
hgsh: hgsh.o
$(CC) -o $@ $<
install: hgsh
install -m755 hgsh $(prefix)
clean:
rm -f *.o hgsh