forgeversion: make version set after release a warning

Let's make parsing a bit more resilient.

rpm/macros.d/macros.forge

@@ -113,7 +113,7 @@ end
 -- Release uses %dist and %distprefix, so we need to make sure it's not used before
 if util.is_defined("release") then
     rpm.expand(
-      "%{error:'Version: %%forgeversion' must be invoked before setting Release.}"
+      "%{warn:'Version: %%forgeversion' must be invoked before setting Release.}"
     )
 end
 \

tests/vectors.yaml

@@ -488,9 +488,8 @@ cases:
     defines:
       version: "1.0.0"
       release: "0"
-    evals:
-      - "%{forgeversion}"
-    should_fail: true
+    expected:
+      forgeversion: "1.0.0"
     stderr_contains: "'Version: %forgeversion' must be invoked before setting Release."
 
   - id: unit_forge_version