Add the tool/omittest-msvc.tcl script that will try to build using MSVC

using various compile-time options, to ensure that the compile-time options
all build without errors.

FossilOrigin-Name: 6b00ecb59fd303f7985902c35a46db9e729201d4beaedea46596b728d9e4b1c8

diff --cc manifest
index 08840043475d8b120e8ae0c61ea1ae6b4d356dd8,1666661e3e252448690491e629065b7b5050229a..e6d926c22b083383c388413e2942897d0f7f4509
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sthe\swindows\sbuild\sso\sthat\sit\sworks\swith\s-DSQLITE_OMIT_AUTOINIT.
- D 2022-09-05T18:17:03.632
 -C Get\sthe\stool/omittest-msvc.tcl\sscript\sworking.
 -D 2022-09-05T22:53:24.940
++C Add\sthe\stool/omittest-msvc.tcl\sscript\sthat\swill\stry\sto\sbuild\susing\sMSVC\nusing\svarious\scompile-time\soptions,\sto\sensure\sthat\sthe\scompile-time\soptions\nall\sbuild\swithout\serrors.
++D 2022-09-05T22:54:36.015
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1999,8 -2000,8 +2000,9 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P da7af290960ab8a04a1f55cdc5eeac36b47fa194edf67f0a05daa4b7f2a4071c
- R 6331ff40a11387db72be313b77cf6d6b
 -P b1e37a0bd31fa9f8e58c2859a80c23a682b4702eefab2c55b243f1e21d475d6c
++P f74a5ea8c986dc33d3afcda169c38abbe55728c56716cf9991a5e2ef7fc4917a 82b89f8a074858a81d841dfc26436e8d39ce4907b8f989eba4d848db16758303
+ R 6ca49c20c002174082011fae5352b9a2
++T +closed 82b89f8a074858a81d841dfc26436e8d39ce4907b8f989eba4d848db16758303
  U drh
- Z c1acc1c86c32ffeafe2e7e809812c8dc
 -Z 569284e867ffbb9e9a0c2176429e582b
++Z 072f191f34018bff25742e9863a6762e
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index aac27db64a7b5b6a4576b642f2df1aae863b1b9f,c61a2eaf21e025c0797f6c5bcddec5927f046766..1a48ad440733cf8003236348ae2c4e8856aacd93
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- f74a5ea8c986dc33d3afcda169c38abbe55728c56716cf9991a5e2ef7fc4917a
 -82b89f8a074858a81d841dfc26436e8d39ce4907b8f989eba4d848db16758303
++6b00ecb59fd303f7985902c35a46db9e729201d4beaedea46596b728d9e4b1c8