Fix a NEVER() macro that can be true if compiled with

SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION.
Ticket [b985f0bd1636d9bc]

FossilOrigin-Name: 9f0f5d593a383ec2bebb6513ad566813f5b3dc6f052c61bcd76e8ac557bbb062

manifest

@@ -1,5 +1,5 @@
-C Version\s3.31.0
-D 2020-01-22T18:38:59.573
+C Fix\sa\sNEVER()\smacro\sthat\scan\sbe\strue\sif\scompiled\swith\nSQLITE_ENABLE_UNKNOWN_SQL_FUNCTION.\nTicket\s[b985f0bd1636d9bc]
+D 2020-01-22T23:08:19.183
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 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -486,7 +486,7 @@ F src/delete.c a5c59b9c0251cf7682bc52af0d64f09b1aefc6781a63592c8f1136f7b73c66e4
 F src/expr.c 003c59158b33d7f3b198122cb0d1e13c06517cc3932e56b42283eb0e96696d66
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 F src/fkey.c 92a248ec0fa4ed8ab60c98d9b188ce173aaf218f32e7737ba77deb2a684f9847
-F src/func.c 92249abc3fd7e52b249ca8eb2d15a617f70819d2fa4c777a4a33552b89bfb322
+F src/func.c 108577cebe8a50c86d849a93b99493a54e348dd0b846f00d13b52ca973d5baf4
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 F src/hash.h 9d56a9079d523b648774c1784b74b89bd93fac7b365210157482e4319a468f38
@@ -1857,10 +1857,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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-T +bgcolor * #d0c0ff
-T +sym-release *
-T +sym-version-3.31.0 *
+P f6affdd41608946fcfcea914ece149038a8b25a62bbe719ed2561c649b86d824
+R 97a04d4b4b8d22f5094487160af0ab4d
 U drh
-Z 51c630793e0eec473e1274a795f77643
+Z 50e2a3e6d4ad40b8e57cb89c95ba8068

manifest.uuid

@@ -1 +1 @@
-f6affdd41608946fcfcea914ece149038a8b25a62bbe719ed2561c649b86d824
+9f0f5d593a383ec2bebb6513ad566813f5b3dc6f052c61bcd76e8ac557bbb062

src/func.c

@@ -1864,6 +1864,9 @@ int sqlite3IsLikeFunction(sqlite3 *db, Expr *pExpr, int *pIsNocase, char *aWc){
   assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
   nExpr = pExpr->x.pList->nExpr;
   pDef = sqlite3FindFunction(db, pExpr->u.zToken, nExpr, SQLITE_UTF8, 0);
+#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
+  if( pDef==0 ) return 0;
+#endif
   if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
     return 0;
   }