made the pack completely portable and wrote relevent bat files to go with it

gitportable/mingw64/lib/reg1.3/pkgIndex.tcl

@@ -0,0 +1,9 @@
+if {![package vsatisfies [package provide Tcl] 8.5]} return
+if {[info sharedlibextension] != ".dll"} return
+if {[::tcl::pkgconfig get debug]} {
+    package ifneeded registry 1.3.5 \
+            [list load [file join $dir tclreg13g.dll] Registry]
+} else {
+    package ifneeded registry 1.3.5 \
+            [list load [file join $dir tclreg13.dll] Registry]
+}