libfcgi: Use SPDX license identifier

The fcgi license is covered by SPDX, the identifier however is not
obvious.

For details, see https://spdx.org/licenses/OML.html

[Peter: add spdx.org link]
Signed-off-by: Alexander Dahl <post@lespocky.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libfcgi/libfcgi.mk

@@ -7,7 +7,7 @@
 LIBFCGI_VERSION = 2.4.0
 LIBFCGI_SOURCE = fcgi-$(LIBFCGI_VERSION).tar.gz
 LIBFCGI_SITE = http://www.fastcgi.com/dist
-LIBFCGI_LICENSE = fcgi license
+LIBFCGI_LICENSE = OML
 LIBFCGI_LICENSE_FILES = LICENSE.TERMS
 LIBFCGI_INSTALL_STAGING = YES
 LIBFCGI_AUTORECONF = YES