[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/tool/replace.tcl

+#!/usr/bin/tcl
+#
+# Replace string with another string -OR- include
+# only lines successfully modified with a regular
+# expression.
+#
+set mode [string tolower [lindex $argv 0]]
+set from [lindex $argv 1]
+set to [lindex $argv 2]
+if {$mode ni [list exact include]} {exit 1}
+if {[string length $from]==0} {exit 2}
+while {![eof stdin]} {
+  set line [gets stdin]
+  if {[eof stdin]} break
+  switch -exact $mode {
+    exact {set line [string map [list $from $to] $line]}
+    include {if {[regsub -all -- $from $line $to line]==0} continue}
+  }
+  puts stdout $line
+}