rpm: remove RLIMIT_NOFILE patch for EL 7 systems

Now that CentOS/RHEL 7 and 8 reached EOL and removed from our packaging
(in 88a6cdc, 67c89e9),
we can remove the patch.

> RLIMIT_NOFILE defaults to an unusable value on EL 7 systems, but more
> modern systems have sane defaults. As such, patch the systemd unit only
> on EL 7 systems to ensure correct behaviour.

This reverts commit 4e7a147.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

rpm/Makefile

@@ -94,11 +94,6 @@ $(DISTROS): sources
 
 .PHONY: sources
 sources: rpmbuild/SOURCES/engine.tgz rpmbuild/SOURCES/cli.tgz rpmbuild/SOURCES/buildx.tgz rpmbuild/SOURCES/compose.tgz
-sources: rpmbuild/SOURCES/01-rlimit_nofile-rhel7.patch
-
-rpmbuild/SOURCES/%.patch:
-	mkdir -p $(@D)
-	cp $(CURDIR)/patches/$(@F) $@
 
 rpmbuild/SOURCES/engine.tgz:
 	mkdir -p $(@D)

rpm/SPECS/docker-ce.spec

@@ -5,7 +5,6 @@ Version: %{_version}
 Release: %{_release}%{?dist}
 Epoch: 3
 Source0: engine.tgz
-Patch0: 01-rlimit_nofile-rhel7.patch
 Summary: The open-source application container engine
 Group: Tools/Docker
 License: ASL 2.0
@@ -70,9 +69,6 @@ depending on a particular stack or provider.
 
 %prep
 %setup -q -c -n src -a 0
-%if 0%{?rhel} == 7
-%patch -p1 -P 0
-%endif
 
 %build