Fix duplicate component codes (#75)

The autogenerated component GUIDs were based on the same path and
therefore were the same in both bitnesses. Installing both worked, but
once one of them was uninstalled, the other's files remained despite
its uninstallation finishing successfully.

I have no idea how this got through my testing; perhaps it only happens
when both merge modules are installed via the same MSI.

Author: chrullrich

installer/psqlodbcm_cpu.wxs

@@ -13,6 +13,7 @@
   <?define UNICODEFOLDER = "x64_Unicode_Release" ?>
   <?define Module_PackageId = "970B6E07-7105-4d66-80FA-9E208952FB96" ?>
   <?define InstallerVersion = "300" ?>
+  <?define GUIDSEED = "400790AA-1377-4E65-B004-AB66FAD634B2" ?>
 <?if $(env.PROCESSOR_ARCHITECTURE) = "AMD64" ?>
   <?define SysFolder = "$(env.SystemRoot)\system32" ?>
 <?else?>
@@ -26,6 +27,7 @@
   <?define UNICODEFOLDER = "x86_Unicode_Release" ?>
   <?define Module_PackageId = "ACF10866-5C01-46f0-90F0-D5618638CA48" ?>
   <?define InstallerVersion = "150" ?>
+  <?define GUIDSEED = "1B43106C-C8D7-4F21-84CF-44DBF1C1D934" ?>
 <?if $(env.PROCESSOR_ARCHITECTURE) = "AMD64" ?>
   <?define SysFolder = "$(env.SystemRoot)\syswow64" ?>
 <?else?>
@@ -49,7 +51,7 @@
       Codepage="1252" />
 
     <!-- Avoid WIX0267 with naked files in a merge module -->
-    <Directory Id="INSTALLFOLDER" />
+    <Directory Id="INSTALLFOLDER" ComponentGuidGenerationSeed="$(GUIDSEED)"/>
 
     <!-- PostgreSQL -->
     <File Name="podbc30a.dll" Source="$(BINBASE)\$(ANSIFOLDER)\psqlodbc30a.dll">