libcurl: bump to version 7.21.7

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libcurl/libcurl.mk

@@ -3,7 +3,8 @@
 # libcurl
 #
 #############################################################
-LIBCURL_VERSION = 7.21.2
+
+LIBCURL_VERSION = 7.21.7
 LIBCURL_SOURCE = curl-$(LIBCURL_VERSION).tar.bz2
 LIBCURL_SITE = http://curl.haxx.se/download/
 LIBCURL_INSTALL_STAGING = YES