libcurl: fix license typo

The license for libcurl is actually 'ISC' not 'ICS'.

Signed-off-by: Ryan Barnett <ryan.barnett@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcurl/libcurl.mk

@@ -11,7 +11,7 @@ LIBCURL_DEPENDENCIES = host-pkgconf \
 	$(if $(BR2_PACKAGE_ZLIB),zlib) \
 	$(if $(BR2_PACKAGE_LIBIDN),libidn) \
 	$(if $(BR2_PACKAGE_RTMPDUMP),rtmpdump)
-LIBCURL_LICENSE = ICS
+LIBCURL_LICENSE = ISC
 LIBCURL_LICENSE_FILES = COPYING
 LIBCURL_INSTALL_STAGING = YES