internal/rosa: patch ignore whitespace

This makes it work better with patches emitted by git.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/rosa.go

@@ -275,7 +275,7 @@ ln -vs ../usr/bin /work/bin
 // NewPatchedSource returns [pkg.Artifact] of source with patches applied. If
 // passthrough is true, source is returned as is for zero length patches.
 func (t Toolchain) NewPatchedSource(
-	name string,
+	name, version string,
 	source pkg.Artifact,
 	passthrough bool,
 	patches ...[2]string,
@@ -293,13 +293,18 @@ func (t Toolchain) NewPatchedSource(
 	}
 	paths[0] = pkg.Path(AbsUsrSrc.Append(name), false, source)
 
-	aname := name + "-src"
+	aname := name + "-" + version + "-src"
 	script := `
 cp -r /usr/src/` + name + `/. /work/.
 chmod -R +w /work && cd /work
 `
 	if len(paths) > 1 {
-		script += `cat /usr/src/` + name + `-patches/* | patch -p 1`
+		script += `
+cat /usr/src/` + name + `-patches/* | \
+	patch \
+	-p 1 \
+	--ignore-whitespace
+`
 		aname += "-patched"
 	}
 	return t.New(aname, stage3Concat(t, []pkg.Artifact{},