Internal md5 and sha1 implementations are now always used.

This reduces the number of moving parts in ABI compatibility checks.
Additionally, it also allows to use OpenSSL in FIPS mode while still
using md5 for non-security tasks.
diff --git a/auto/module b/auto/module
index 16a816f..3b00a07 100644
--- a/auto/module
+++ b/auto/module
@@ -48,10 +48,14 @@
                 fi
             ;;
 
-            PCRE | OPENSSL | MD5 | SHA1 | ZLIB)
+            PCRE | OPENSSL | ZLIB)
                 eval USE_${lib}=YES
             ;;
 
+            MD5 | SHA1)
+                # obsolete
+            ;;
+
             *)
                 libs="$libs $lib"
             ;;
@@ -79,10 +83,14 @@
     do
         case $lib in
 
-            PCRE | OPENSSL | MD5 | SHA1 | ZLIB | LIBXSLT | LIBGD | PERL | GEOIP)
+            PCRE | OPENSSL | ZLIB | LIBXSLT | LIBGD | PERL | GEOIP)
                 eval USE_${lib}=YES
             ;;
 
+            MD5 | SHA1)
+                # obsolete
+            ;;
+
             *)
                 CORE_LIBS="$CORE_LIBS $lib"
             ;;
@@ -109,10 +117,14 @@
     do
         case $lib in
 
-            PCRE | OPENSSL | MD5 | SHA1 | ZLIB | LIBXSLT | LIBGD | PERL | GEOIP)
+            PCRE | OPENSSL | ZLIB | LIBXSLT | LIBGD | PERL | GEOIP)
                 eval USE_${lib}=YES
             ;;
 
+            MD5 | SHA1)
+                # obsolete
+            ;;
+
             *)
                 CORE_LIBS="$CORE_LIBS $lib"
             ;;