EXT-7145: PARTIAL make viewer to handle "URL redirect " for http texture.

This upgrades linux libcurl(+ares) to the lindenlib 7.20.1 version.

install.xml

@@ -118,9 +118,9 @@
           <key>linux</key>
           <map>
             <key>md5sum</key>
-            <string>946c2e106f14f7a1e521d4a14e0e146f</string>
+            <string>91694429e391efeea1de974df26032a2</string>
             <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/ares-1.4.0-linux-20081202.tar.bz2</uri>
+            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/ares-1.7.1-linux-20100527.tar.bz2</uri>
           </map>
           <key>linux64</key>
           <map>
@@ -240,9 +240,9 @@
           <key>linux</key>
           <map>
             <key>md5sum</key>
-            <string>0f366e421ae9c72d9659bd20a2a326d6</string>
+            <string>a20e73f2e7d6a032ff25a5161b1b7394</string>
             <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/curl-7.16.4a-linux-20090303a.tar.bz2</uri>
+            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/curl-7.20.1-linux-20100527.tar.bz2</uri>
           </map>
           <key>linux64</key>
           <map>