Makefile: Update but disable 'lint' target, using splint with some quirks

Reviewed-by: NPaul Dale <pauli@openssl.org>
Reviewed-by: NTomas Mraz <tomas@openssl.org>
Reviewed-by: NDavid von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/15913)

Configurations/unix-Makefile.tmpl

@@ -1130,8 +1130,11 @@ md-nits:
 #coverage: $(PROGRAMS) $(TESTPROGRAMS)
 #	...
 
+.PHONY: lint
 lint:
-	lint -DLINT $(INCLUDES) $(SRCS)
+	@( cd $(SRCDIR); \
+           echo splint -DLINT -posixlib -preproc -D__gnuc_va_list=void \
+	   -I. -Iinclude -Iapps/include $(CRYPTOHEADERS) $(SSLHEADERS) $(SRCS) )
 
 generate_apps:
 	( cd $(SRCDIR); $(PERL) VMS/VMSify-conf.pl \