The unified build may delete installed manual files

The installation of man files and html files alike didn't properly
check that file names with different casing could be the same on
case-insensitive file systems.  This change fixes that.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Configurations/unix-Makefile.tmpl

@@ -406,7 +406,14 @@ PROCESS_PODS=\
 		names=`cat $$p | $(EXTRACT_NAMES)`; \
 		( cd $$top/man$$SEC; \
 		  for n in $$names; do \
-		      if [ "$$n" != "$$fn" ]; then \
+		      comp_n="$$n"; \
+		      comp_fn="$$fn"; \
+		      case "$(PLATFORM)" in DJGPP|Cygwin*|mingw*|darwin*-*-cc) \
+			  comp_n=`echo "$$n" | tr [A-Z] [a-z]`; \
+			  comp_fn=`echo "$$fn" | tr [A-Z] [a-z]`; \
+			  ;; \
+		      esac; \
+		      if [ "$$comp_n" != "$$comp_fn" ]; then \
 			  echo "link $$top/man$$SEC/$$n$$suf -> $$top/man$$SEC/$$fn$$suf"; \
 			  PLATFORM=$(PLATFORM) $$point $$fn$$suf $$n$$suf; \
 		      fi; \
@@ -429,7 +436,14 @@ UNINSTALL_DOCS=\
 	        $(RM) $$top/man$$SEC/$$fn$$suf; \
 		names=`cat $$p | $(EXTRACT_NAMES)`; \
 		for n in $$names; do \
-		    if [ "$$n" != "$$fn" ]; then \
+		    comp_n="$$n"; \
+		    comp_fn="$$fn"; \
+		    case "$(PLATFORM)" in DJGPP|Cygwin*|mingw*|darwin*-*-cc) \
+			comp_n=`echo "$$n" | tr [A-Z] [a-z]`; \
+			comp_fn=`echo "$$fn" | tr [A-Z] [a-z]`; \
+			;; \
+		    esac; \
+		    if [ "$$comp_n" != "$$comp_fn" ]; then \
 			echo "$(RM) $$top/man$$SEC/$$n$$suf"; \
 			$(RM) $$top/man$$SEC/$$n$$suf; \
 		    fi; \