Use default copy-constructor for LineInfo

The LineInfo class defines a copy-constructor, but relies on the default
copy-assignment operator.

In newer versions of C++ this deprecated and modern compilers generate a
warning about this. A class must either use the default copy-constructor
and default copy-assignment operator or provide a user defined version of
both.

Since the current user-defined copy-constructor for LineInfo does the same
as the default copy-constructor, remove the custom one and rely on the
default constructor.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

libmisc/LineInfo.cc

@@ -27,11 +27,6 @@ LineInfo::LineInfo()
 {
 }
 
-LineInfo::LineInfo(const LineInfo&that) :
-    file_(that.file_), lineno_(that.lineno_)
-{
-}
-
 LineInfo::~LineInfo()
 {
 }

libmisc/LineInfo.h

@@ -34,7 +34,6 @@
 class LineInfo {
     public:
       LineInfo();
-      LineInfo(const LineInfo&that);
       virtual ~LineInfo();
 
 	// Get a fully formatted file/lineno