internal/rosa: enable static on various artifacts

This is implicitly enabled sometimes, but better to be explicit.

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

internal/rosa/libxml2.go

@@ -21,7 +21,8 @@ mv libxml2-`+version+` libxml2
 cd "$(mktemp -d)"
 /usr/src/libxml2/configure \
 	--prefix=/system \
-	--build="${ROSA_TRIPLE}"
+	--build="${ROSA_TRIPLE}" \
+	--enable-static
 make "-j$(nproc)" check
 make DESTDIR=/work install
 `, pkg.Path(AbsUsrSrc.Append("libxml2.tar.xz"), false, pkg.NewHTTPGet(