make: revert switch to 'go install'

go install acts incredibly weirdly and rarely does what you want, not to
mention that it's just bad for distribution build setups. Switch back to
go build, which works properly and doesn't have half as many issues.

Fixes: 6c9628cdb1 ("Build and install from GOPATH")
Signed-off-by: Aleksa Sarai <asarai@suse.de>

Makefile

@@ -13,8 +13,6 @@ ETCDIR ?= ${DESTDIR}/etc
 ETCDIR_OCID ?= ${ETCDIR}/ocid
 BUILDTAGS := selinux seccomp $(shell hack/btrfs_tag.sh) $(shell hack/libdm_tag.sh)
 BASHINSTALLDIR=${PREFIX}/share/bash-completion/completions
-GOBINDIR := $(word 1,$(subst :, ,$(GOPATH)))
-PATH := $(GOBINDIR)/bin:$(PATH)
 
 all: binaries ocid.conf docs
 
@@ -60,15 +58,15 @@ checkseccomp: check-gopath
 	$(MAKE) -C test/$@
 
 ocid: check-gopath
-	$(GO) install \
+	$(GO) build -o $@ \
 		-tags "$(BUILDTAGS)" \
 		$(PROJECT)/cmd/ocid
 
 ocic: check-gopath
-	$(GO) install $(PROJECT)/cmd/ocic
+	$(GO) build -o $@ $(PROJECT)/cmd/ocic
 
 kpod: check-gopath
-	$(GO) install $(PROJECT)/cmd/kpod
+	$(GO) build -o $@ $(PROJECT)/cmd/kpod
 
 ocid.conf: ocid
 	ocid --config="" config --default > ocid.conf
@@ -78,6 +76,7 @@ clean:
 	rm -fr test/testdata/redis-image
 	find . -name \*~ -delete
 	find . -name \#\* -delete
+	rm -f ocic ocid kpod
 	make -C conmon clean
 	make -C pause clean
 	make -C test/bin2img clean
@@ -113,9 +112,9 @@ docs/%.8: docs/%.8.md check-gopath
 docs: $(MANPAGES)
 
 install: check-gopath
-	install -D -m 755 $(GOBINDIR)/bin/ocid $(BINDIR)/ocid
-	install -D -m 755 $(GOBINDIR)/bin/ocic $(BINDIR)/ocic
-	install -D -m 755 $(GOBINDIR)/bin/kpod $(BINDIR)/kpod
+	install -D -m 755 ocid $(BINDIR)/ocid
+	install -D -m 755 ocic $(BINDIR)/ocic
+	install -D -m 755 kpod $(BINDIR)/kpod
 	install -D -m 755 conmon/conmon $(LIBEXECDIR)/ocid/conmon
 	install -D -m 755 pause/pause $(LIBEXECDIR)/ocid/pause
 	install -d -m 755 $(MANDIR)/man1