Rip out non-endomorphism code

contrib/travis.sh

@@ -13,7 +13,7 @@ then
 fi
 
 ./configure \
-    --enable-experimental="$EXPERIMENTAL" --enable-endomorphism="$ENDOMORPHISM" \
+    --enable-experimental="$EXPERIMENTAL" \
     --with-test-override-wide-multiply="$WIDEMUL" --with-bignum="$BIGNUM" --with-asm="$ASM" \
     --enable-ecmult-static-precomputation="$STATICPRECOMPUTATION" --with-ecmult-gen-precision="$ECMULTGENPRECISION" \
     --enable-module-ecdh="$ECDH" --enable-module-recovery="$RECOVERY" \