crypto/gc-hmac-sha1: Fix recent regression. * modules/crypto/gc-hmac-sha1 (Files): Remove m4/hmac-sha1.m4. (configure.ac): Invoke AC_LIBOBJ here. * m4/gc-hmac-sha1.m4 (gl_GC_HMAC_SHA1): Don't invoke gl_HMAC_SHA1. Reported by Tom G. Christensen <tgc@jupiterrise.com>.