app-portage/eix: this package is not proxy-maintained

As explained by the upstream author on the bug, he is not a proxied
maintainer for a long time. Update the metadata to indicate that
clearly, and remove the proxy-maint project as irrelevant.

Closes: https://bugs.gentoo.org/632998

app-portage/eix/metadata.xml

@@ -1,18 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="person">
-    <email>[email protected]</email>
-    <name>Martin Väth</name>
-    <description>Upstream developer, assign bugs</description>
-  </maintainer>
   <maintainer type="person">
     <email>[email protected]</email>
     <name>Michael Weber</name>
   </maintainer>
-  <maintainer type="project">
-    <email>[email protected]</email>
-    <name>Proxy Maintainers</name>
+  <maintainer type="person">
+    <email>[email protected]</email>
+    <name>Martin Väth</name>
+    <description>Upstream developer, CC on bugs, do not copy ebuilds
+      from his overlay</description>
   </maintainer>
   <use>
     <flag name="debug">Build with upstream's CXXFLAGS/LDFLAGS for debugging support; not recommended for normal use.</flag>