Revert "work around pip; just specify the next snakeoil release required"

This reverts commit 95f7ce4.

Whilst we depend on an unreleased snakeoil version, thus far a way to state
"we depend on dev xyz" whilst not having it exist in pypi is just flat out
failing for any pip analogue I've tried.

Having pyproject point at the vcs works for that specific package, but pip
resolution doesn't recover the version from what it installed in a way the
resolution graph can treat it as something like 0.11.1.dev0.  Effectively-
in the testing I've done- it has to be VCS all the way down through the consumers
which isn't acceptable.

Thus revert this down to relying on just VCS.

Signed-off-by: Brian Harring <ferringb@gmail.com>

Author: ferringb

pyproject.toml

@@ -1,7 +1,8 @@
 [build-system]
 requires = [
 	"flit_core >=3.8,<4",
-	"snakeoil >= 0.11.1.dev0",
+	# replace with 0.11.1 when it's released
+	"snakeoil@git+https://github.com/pkgcore/snakeoil.git#master",
 ]
 build-backend = "py_build"
 backend-path = ["."]
@@ -32,7 +33,7 @@ classifiers = [
 dynamic = ["version"]
 
 dependencies = [
-	"snakeoil >= 0.11.1.dev0",
+	"snakeoil@git+https://github.com/pkgcore/snakeoil.git#master",
 	"lxml",
 ]