Remove automatic RPATH - add user rpath support

Make Configure recognise -rpath and -R to support user added rpaths
for OSF1 and Solaris.  For convenience, add a variable LIBRPATH in the
Unix Makefile, which the users can use as follows:

    ./config [options] -Wl,-rpath,\$(LIBRPATH)

Reviewed-by: Rich Salz <rsalz@openssl.org>

Configurations/unix-Makefile.tmpl

@@ -153,6 +153,10 @@ LIBDIR={- #
 ENGINESDIR={- use File::Spec::Functions;
               catdir($prefix,$libdir,"engines-$sover") -}
 
+# Convenience variable for those who want to set the rpath in shared
+# libraries and applications
+LIBRPATH=$(INSTALLTOP)/$(LIBDIR)
+
 MANDIR=$(INSTALLTOP)/share/man
 DOCDIR=$(INSTALLTOP)/share/doc/$(BASENAME)
 HTMLDIR=$(DOCDIR)/html
@@ -1094,7 +1098,7 @@ $bin$exeext: $objs $deps
 		APPNAME=$bin$exeext OBJECTS="$objs" \\
 		LIBDEPS='\$(PLIB_LDFLAGS) '"$linklibs"' \$(EX_LIBS)' \\
 		CC='$cc' CFLAGS='$cflags' \\
-		LDFLAGS='\$(LDFLAGS)' LIBRPATH='\$(INSTALLTOP)/\$(LIBDIR)' \\
+		LDFLAGS='\$(LDFLAGS)' \\
 		link_app.$shlib_target
 EOF
   }

Configure

@@ -545,8 +545,9 @@ $config{build_type} = "release";
 
 my %unsupported_options = ();
 my %deprecated_options = ();
-foreach (@argvcopy)
+while (@argvcopy)
 	{
+	$_ = shift @argvcopy;
 	# VMS is a case insensitive environment, and depending on settings
 	# out of our control, we may receive options uppercased.  Let's
 	# downcase at least the part before any equal sign.
@@ -733,6 +734,14 @@ foreach (@argvcopy)
 			{
 			$libs.=$_." ";
 			}
+		elsif (/^-rpath$/ or /^-R$/)
+			# -rpath is the OSF1 rpath flag
+			# -R is the old Solaris rpath flag
+			{
+			my $rpath = shift(@argvcopy) || "";
+			$rpath .= " " if $rpath ne "";
+			$libs.=$_." ".$rpath;
+			}
 		elsif (/^-static$/)
 			{
 			$libs.=$_." ";