RT2880: HFS is case-insensitive filenames

Add Darwin to list of case-insensitive filenames when
installing manapges.  When doing this, I noticed that
we weren't setting "filecase" for the HTML doc install.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Makefile.org

@@ -710,6 +710,10 @@ install_sw:
 
 install_html_docs:
 	here="`pwd`"; \
+	filecase=; \
+	case "$(PLATFORM)" in DJGPP|Cygwin*|mingw*|darwin-*-cc) \
+		filecase=-i; \
+	esac; \
 	for subdir in apps crypto ssl; do \
 		mkdir -p $(INSTALL_PREFIX)$(HTMLDIR)/$$subdir; \
 		for i in doc/$$subdir/*.pod; do \
@@ -738,7 +742,7 @@ install_docs:
 	@pod2man="`cd ./util; ./pod2mantest $(PERL)`"; \
 	here="`pwd`"; \
 	filecase=; \
-	case "$(PLATFORM)" in DJGPP|Cygwin*|mingw*) \
+	case "$(PLATFORM)" in DJGPP|Cygwin*|mingw*|darwin-*-cc) \
 		filecase=-i; \
 	esac; \
 	set -e; for i in doc/apps/*.pod; do \