Makefile: Rename $(CURDIR)/bin/crc$(IS_EXE) rule

This rule is marked as .PHONY, which instructs make that
$(CURDIR)/bin/crc$(IS_EXE) is a 'virtual' target name, and does not
correspond to an actual file existing on disk. We thus don't really have
to make it that complicated, since this rule installs the crc binary
with "go install", we can just rename it to "install" and make the
Makefile slightly easier to read.

Author: cfergeau

Makefile

@@ -31,9 +31,6 @@ GOOS ?= $(shell go env GOOS)
 GOARCH ?= $(shell go env GOARCH)
 ORG := github.com/code-ready
 REPOPATH ?= $(ORG)/crc
-ifeq ($(GOOS),windows)
-	IS_EXE := .exe
-endif
 
 PACKAGES := go list ./... | grep -v /out
 
@@ -62,7 +59,7 @@ LDFLAGS := $(VERSION_VARIABLES) -extldflags='-static' -s -w
 
 # Add default target
 .PHONY: default
-default: $(CURDIR)/bin/crc$(IS_EXE)
+default: install
 
 # Create and update the vendor directory
 .PHONY: vendor
@@ -75,8 +72,8 @@ binappend:
 
 # Start of the actual build targets
 
-.PHONY: $(CURDIR)/bin/crc$(IS_EXE)
-$(CURDIR)/bin/crc$(IS_EXE):
+.PHONY: install
+install:
 	go install -ldflags="$(VERSION_VARIABLES)" ./cmd/crc
 
 $(BUILD_DIR)/darwin-amd64/crc: