mit-krb5.pc: Add missing -lkrb5profile

Fixes the ports that prefer static linking:
https://reviews.freebsd.org/D49277

Reviewed by:	ivy, dch, cy
Sponsored by:	SkunkWerks, GmbH
Differential Revision:	https://reviews.freebsd.org/D52910

Author: ihoro

crypto/krb5/src/build-tools/mit-krb5.pc.in

@@ -12,4 +12,4 @@ Description: An implementation of Kerberos network authentication
 Version: @KRB5_VERSION@
 Cflags: -I${includedir}
 Libs: -L${libdir} -lkrb5 -lk5crypto @COM_ERR_LIB@
-Libs.private: -lkrb5support
+Libs.private: -lkrb5support -lkrb5profile