pyproject.toml: move brial and eclib to optional-host-requires

It is now possible to build sagelib without these libraries; the
corresponding extensions are automatically disabled by meson.

Author: orlitzky

pyproject.toml

@@ -129,11 +129,9 @@ host-requires = [
   "virtual:interface/blas",
   "virtual:compiler/fortran",
   "pkg:generic/boost",
-  "pkg:generic/brial",
   "pkg:generic/cddlib",
   "pkg:generic/cliquer",
   "pkg:generic/ecl",
-  "pkg:generic/eclib",
   "pkg:generic/ecm",
   "pkg:generic/fflas-ffpack",
   "pkg:generic/flint",
@@ -183,7 +181,9 @@ dependencies = [
 [external.optional-host-requires]
 extra = [
   "pkg:generic/bliss",
+  "pkg:generic/brial",
   "pkg:generic/coxeter3",
+  "pkg:generic/eclib",
   "pkg:generic/mcqd",
   "pkg:generic/meataxe",
   "pkg:generic/sirocco",