app-containers/docker: drop USE=hardened hacks

1. These aren't needed on hardened systems anyway (we've had default PIE
on normal, non-hardened systems for years);

2. The relevant variables are gone upstream, see
877baae03e,
which fails because of the grep sanity check in the ebuild (correctly);

3. If we did need to keep this check, we would need to do it based on a
e.g. toolchain-funcs function to check if the toolchain defaults to PIE,
but not based on USE=hardened.

Closes: https://bugs.gentoo.org/900849
Signed-off-by: Sam James <sam@gentoo.org>

app-containers/docker/docker-23.0.1.ebuild

@@ -253,14 +253,6 @@ src_compile() {
 		fi
 	done
 
-	if use hardened; then
-		sed -i "s/EXTLDFLAGS_STATIC='/&-fno-PIC /" hack/make.sh || die
-		grep -q -- '-fno-PIC' hack/make.sh || die 'hardened sed failed'
-		sed  "s/LDFLAGS_STATIC_DOCKER='/&-extldflags -fno-PIC /" \
-			-i hack/make/dynbinary-daemon || die
-		grep -q -- '-fno-PIC' hack/make/dynbinary-daemon || die 'hardened sed failed'
-	fi
-
 	# build daemon
 	./hack/make.sh dynbinary || die 'dynbinary failed'
 }