fix gomod2rpmdeps installation

'make spec' currently fails with the following error:
```
pushd /tmp && GO111MODULE=on go get github.com/cfergeau/gomod2rpmdeps/cmd/gomod2rpmdeps && popd
/tmp ~/work/crc
go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.
make: *** [/Users/anjan/go/bin/gomod2rpmdeps] Error 1
```

Makefile

@@ -343,11 +343,11 @@ $(BUILD_DIR)/macos-universal/crc-macos-installer.tar: packagedir
 	tar -cvf $@ ./packaging
 	cd $(@D) && sha256sum $(@F)>$(@F).sha256sum
 
-$(GOPATH)/bin/gomod2rpmdeps:
-	pushd /tmp && GO111MODULE=on go get github.com/cfergeau/gomod2rpmdeps/cmd/gomod2rpmdeps && popd
+$(TOOLS_BINDIR)/gomod2rpmdeps:
+	GOBIN=$(TOOLS_BINDIR) go install -mod=mod github.com/cfergeau/gomod2rpmdeps/cmd/gomod2rpmdeps@latest
 
-%.spec: %.spec.in $(GOPATH)/bin/gomod2rpmdeps
-	@$(GOPATH)/bin/gomod2rpmdeps | sed -e '/__BUNDLED_PROVIDES__/r /dev/stdin' \
+%.spec: %.spec.in $(TOOLS_BINDIR)/gomod2rpmdeps
+	@$(TOOLS_BINDIR)/gomod2rpmdeps | sed -e '/__BUNDLED_PROVIDES__/r /dev/stdin' \
 					   -e '/__BUNDLED_PROVIDES__/d' \
 					   -e 's/__VERSION__/'$(CRC_VERSION)'/g' \
 					   -e 's/__OPENSHIFT_VERSION__/'$(OPENSHIFT_VERSION)'/g' \

tools/bin/.gitignore

@@ -1,2 +1,3 @@
 golangci-lint
 golangci-lint.exe
+gomod2rpmdeps