Fixes to CROSS_COMPILE, don't override command line option from environment

Configure

diff --git a/Configure b/Configure
index b132711..810afbd 100755
--- a/Configure
+++ b/Configure
@@ -1047,7 +1047,7 @@
 $perl=$ENV{'PERL'} or $perl=&which("perl5") or $perl=&which("perl")
   or $perl="perl";
 
-$cross_compile_prefix=$ENV{'CROSS_COMPILE'};
+$cross_compile_prefix=$ENV{'CROSS_COMPILE'} if $cross_compile_prefix eq "";
 
 chop $openssldir if $openssldir =~ /\/$/;
 chop $prefix if $prefix =~ /.\/$/;