Fix upstream issue 'Regression from commit e7f5981 breaks many hitherto valid SVG icons #188', see memononen/nanosvg#188

From Tk commit https://core.tcl-lang.org/tk/info/2b07cb2b9e86e2c4
Bump Version to 0.7. Still waiting for big files bug decission in Tk for a release.

Author: oehhar

configure.in

@@ -19,7 +19,7 @@ dnl	to configure the system for the local environment.
 # so you can encode the package version directly into the source files.
 #-----------------------------------------------------------------------
 
-AC_INIT([tksvg], [0.6])
+AC_INIT([tksvg], [0.7])
 
 #--------------------------------------------------------------------
 # Call TEA_INIT as the first TEA_ macro to set up initial vars.