Merge pull request #13449 from JuliaLang/sf/morethanonewaytoskina

Fix `cat` warning messages by using file existence check instead

Makefile

@@ -449,7 +449,7 @@ endif
 ifeq ($(OS), Linux)
 	-$(JULIAHOME)/contrib/fixup-libstdc++.sh $(DESTDIR)$(private_libdir)
 	# We need to bundle ca certs on linux now that we're using libgit2 with ssl
-ifneq ($(shell cat $(shell openssl version -d | cut -d '"' -f 2)/cert.pem),)
+ifeq ($(shell [ -e $(shell openssl version -d | cut -d '"' -f 2)/cert.pem ] && echo exists),exists)
 	-cp $(shell openssl version -d | cut -d '"' -f 2)/cert.pem $(DESTDIR)$(datarootdir)/julia/
 endif
 endif