Allow the iif() function to work with two arguments. The third argument is

then assumed to be NULL.  Also allow if() as an alternative spelling for iif().

FossilOrigin-Name: 1e405c39a8405e2081ce061559d1aacc70055fc74ab86d886b973076a3fb124b

diff --cc manifest
index 229dfdc3aaff6b637bfd177942ac51f5c28349a4,39768dacac1fdc000411df68a69ad9fe359ca2bd..b0e612caa97f6436940417b54943ece4df9e066e
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Update\sfts5\sso\sthat\sthe\sxInstToken()\sextension\sAPI\sworks\swith\sprefix\squeries.
- D 2024-11-26T20:46:18.270
 -C New\stest\scases.
 -D 2024-11-26T23:30:49.285
++C Allow\sthe\siif()\sfunction\sto\swork\swith\stwo\sarguments.\s\sThe\sthird\sargument\sis\nthen\sassumed\sto\sbe\sNULL.\s\sAlso\sallow\sif()\sas\san\salternative\sspelling\sfor\siif().
++D 2024-11-26T23:40:54.327
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md e108e1e69ae8e8a59e93c455654b8ac9356a11720d3345df2a4743e9590fb20d
@@@ -2201,9 -2201,8 +2201,9 @@@ F tool/version-info.c 3b36468a90faf1bbd
  F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
  F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 00dffd10f0c77fed53bdbf1536f6ef9b6076775f1b9a10794b87e3ace33ca1d9 f1e44f703acb415e2ff7d7f87fa05fc874ef1c432095bb3ccb45c6ad2fd085a9
- R 602e6f17d656c7098c104c9738f971e9
- T +closed f1e44f703acb415e2ff7d7f87fa05fc874ef1c432095bb3ccb45c6ad2fd085a9
- U dan
- Z 2fe59ff619562212dac3a249eb517d01
 -P a251ee645e11e24b67473d8a5bd3f8b72fde1ac9d5fda074f5da2297deb2faa8
++P 41b79bde4a4b6510b41cc9175ff2527fbd3ca9209812361783754f24cf67ef9e f1cb1a815a09d71eb52d5c7f2f4e5c7689535232dee365e46ac41cce7fd86c01
+ R 824c1bcdb1f9c6fee7135023d460cb90
++T +closed f1cb1a815a09d71eb52d5c7f2f4e5c7689535232dee365e46ac41cce7fd86c01
+ U drh
 -Z ccd3808eb790ff48c86b29439b672954
++Z f391a3d677bdf348a89a60afcfdaaa8e
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 60ed7fd51dbdc6d341b331a15a661e3633b7f666,fb01172fbbb0b54da26bd638195d331462b76bb5..6f170f7b2f570d6dae328068161c0cf00e539109
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 41b79bde4a4b6510b41cc9175ff2527fbd3ca9209812361783754f24cf67ef9e
 -f1cb1a815a09d71eb52d5c7f2f4e5c7689535232dee365e46ac41cce7fd86c01
++1e405c39a8405e2081ce061559d1aacc70055fc74ab86d886b973076a3fb124b