wix: drop bin/ folder from MSI installers (issue 2673)

Also fixes issue 2658.

contrib/wix/guids.wxi

@@ -47,6 +47,5 b''
   <?define paths.rc.guid = {F9ADF21D-5F0B-4934-8CD9-14BE63664721} ?>
   <?define cacert.pem.guid = {EC1B2630-FE21-46E6-915B-A6545AF703D4} ?>
   <?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
-  <?define hgcmd.guid = {65CCC756-E72E-4C5F-901E-D575EDC80DB3} ?>
 
 </Include>

contrib/wix/mercurial.wxs

@@ -62,7 +62,7 b''
           <Component Id='MainExecutable' Guid='$(var.ComponentMainExecutableGUID)' Win64='$(var.IsX64)'>
             <File Id='hgEXE' Name='hg.exe' Source='dist\hg.exe' KeyPath='yes' />
             <Environment Id="Environment" Name="PATH" Part="last" System="yes"
-                         Permanent="no" Value="[INSTALLDIR]bin" Action="set" />
+                         Permanent="no" Value="[INSTALLDIR]" Action="set" />
           </Component>
           <Component Id='ReadMe' Guid='$(var.ReadMe.guid)' Win64='$(var.IsX64)'>
               <File Id='ReadMe' Name='ReadMe.html' Source='contrib\win32\ReadMe.html'
@@ -93,11 +93,6 b''
             </Component>
           </Directory>
 
-          <Directory Id='binFolder' Name='bin'>
-            <Component Id='HgCmd' Guid='$(var.hgcmd.guid)' Win64='$(var.IsX64)'>
-                <File Id='Hg.Cmd' Name='hg.cmd' KeyPath='yes' Source='contrib\wix\hg.cmd' />
-            </Component>
-          </Directory>
         </Directory>
       </Directory>
 
@@ -140,7 +135,6 b''
         <ComponentRef Id='paths.rc' />
         <ComponentRef Id='cacert.pem' />
         <ComponentRef Id='helpFolder' />
-        <ComponentRef Id='HgCmd' />
         <ComponentGroupRef Id='templatesFolder' />
         <MergeRef Id='VCRuntime' />
         <MergeRef Id='VCRuntimePolicy' />