Patch by Zarafa <http://www.zarafa.com/> - when an email header has the data part on the second line,
vmime was unable to parse this data and skip adds the header as empty to it's internal structures. This
makes sure these headers are still correctly parsed.

--- libvmime-0.7.1/src/headerField.cpp					2007-01-26 14:44:10.315567250 +0100
+++ libvmime-0.7.1/src/headerField.cpp.header-value-on-next-line	2007-02-07 13:35:35.177077750 +0100
@@ -147,14 +147,12 @@
 					{
 						contentsEnd = pos;
 						pos += 2;
-						break;
 					}
 					else if (c == '\n')
 					{
 						contentsEnd = pos;
 						++pos;
-						break;
-					}
+					} else {
 
 					while (pos < end)
 					{
@@ -176,6 +174,7 @@
 
 						++pos;
 					}
+					}
 
 					// Handle the case of folded lines
 					if (buffer[pos] == ' ' || buffer[pos] == '\t')