Tentatively add support for UWIN, a Unix-like environment on top of Windows.
PR: 62

Configure

diff --git a/Configure b/Configure
index 35520b5..83c1349 100755
--- a/Configure
+++ b/Configure
@@ -509,6 +509,9 @@
 # and its library files in util/pl/*)
 "Mingw32", "gcc:-DL_ENDIAN -fomit-frame-pointer -O3 -m486 -Wall:::::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}::::::::::win32",
 
+# UWIN 
+"UWIN", "cc:-DTERMIOS -DL_ENDIAN -O -Wall:::UWIN::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}::::::::::win32",
+
 # Cygwin
 "Cygwin-pre1.3", "gcc:-DTERMIOS -DL_ENDIAN -fomit-frame-pointer -O3 -m486 -Wall::(unknown):CYGWIN32::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}::::::::::win32",
 "Cygwin", "gcc:-DTERMIOS -DL_ENDIAN -fomit-frame-pointer -O3 -m486 -Wall:::CYGWIN32::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_out_asm}:win32:cygwin-shared:::.dll",