chore: remove parsebool script

The reason is same as in siderolabs/talos#3678, it breaks
release-tool.

Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>

Makefile

@@ -23,13 +23,13 @@ GO_LDFLAGS ?=
 WITH_RACE ?= false
 WITH_DEBUG ?= false
 
-ifeq ($(shell hack/parsebool.sh $(WITH_RACE); echo $$?), 1)
+ifneq (, $(filter $(WITH_RACE), t true TRUE y yes 1))
 CGO_ENABLED = 1
 GO_BUILDFLAGS += -race
 GO_LDFLAGS += -linkmode=external -extldflags '-static'
 endif
 
-ifeq ($(shell hack/parsebool.sh $(WITH_DEBUG); echo $$?), 1)
+ifneq (, $(filter $(WITH_DEBUG), t true TRUE y yes 1))
 GO_BUILDFLAGS += -tags sidero.debug
 else
 GO_LDFLAGS += -s -w