Makefile: Use portable !, not GNUish -not, with find(1). (#24565)

fix #24564

Co-authored-by: Taylor R Campbell <[email protected]>

Author: riastradh

Makefile

@@ -139,7 +139,7 @@ GO_DIRS := build cmd models modules routers services tests
 WEB_DIRS := web_src/js web_src/css
 
 GO_SOURCES := $(wildcard *.go)
-GO_SOURCES += $(shell find $(GO_DIRS) -type f -name "*.go" -not -path modules/options/bindata.go -not -path modules/public/bindata.go -not -path modules/templates/bindata.go)
+GO_SOURCES += $(shell find $(GO_DIRS) -type f -name "*.go" ! -path modules/options/bindata.go ! -path modules/public/bindata.go ! -path modules/templates/bindata.go)
 GO_SOURCES += $(GENERATED_GO_DEST)
 GO_SOURCES_NO_BINDATA := $(GO_SOURCES)