simplify symbol files a wee bit

debian/libapt-inst1.2.symbols

@@ -1,5 +1,4 @@
 libapt-inst.so.1.2 libapt-inst1.2
-| libapt-inst1.2 #MINVER#
 * Build-Depends-Package: libapt-pkg-dev
  (c++)"ExtractTar::Done(bool)@Base" 0.8.0
  (c++)"ExtractTar::Go(pkgDirStream&)@Base" 0.8.0

debian/libapt-pkg4.10.symbols

@@ -1,5 +1,4 @@
 libapt-pkg.so.4.10 libapt-pkg4.10
-| libapt-pkg4.10 #MINVER#
 * Build-Depends-Package: libapt-pkg-dev
  TFRewritePackageOrder@Base 0.8.0
  TFRewriteSourceOrder@Base 0.8.0