Update sqlite to 3.7.3.

third_party/sqlite/src/tool/mksqlite3h.tcl

 #!/usr/bin/tclsh
 #
 # This script constructs the "sqlite3.h" header file from the following
 # sources:
 #
 #   1) The src/sqlite.h.in source file.  This is the template for sqlite3.h.
 #   2) The VERSION file containing the current SQLite version number.
 #   3) The manifest file from the fossil SCM.  This gives use the date.
 #   4) The manifest.uuid file from the fossil SCM.  This gives the SHA1 hash.
 #
@@ skipping 47 matching lines @@
     break
   }
 }
 close $in
 
 # Set up patterns for recognizing API declarations.
 #
 set varpattern {^[a-zA-Z][a-zA-Z_0-9 *]+sqlite3_[_a-zA-Z0-9]+(\[|;| =)}
 set declpattern {^ *[a-zA-Z][a-zA-Z_0-9 ]+ \**sqlite3_[_a-zA-Z0-9]+\(}
 
-# Process the  src/sqlite.h.in  file.
+# Process the src/sqlite.h.in ext/rtree/sqlite3rtree.h files.
 #
-set in [open $TOP/src/sqlite.h.in]
-while {![eof $in]} {
+foreach file [list $TOP/src/sqlite.h.in $TOP/ext/rtree/sqlite3rtree.h] {
+  set in [open $file]
+  while {![eof $in]} {
+  
+    set line [gets $in]
 
-  set line [gets $in]
-
-  regsub -- --VERS--           $line $zVersion line
-  regsub -- --VERSION-NUMBER-- $line $nVersion line
-  regsub -- --SOURCE-ID--      $line "$zDate $zUuid" line
-
-  if {[regexp {define SQLITE_EXTERN extern} $line]} {
+    # File sqlite3rtree.h contains a line "#include <sqlite3.h>". Omit this
+    # line when copying sqlite3rtree.h into sqlite3.h.
+    #
+    if {[string match {*#include*<sqlite3.h>*} $line]} continue
+  
+    regsub -- --VERS--           $line $zVersion line
+    regsub -- --VERSION-NUMBER-- $line $nVersion line
+    regsub -- --SOURCE-ID--      $line "$zDate $zUuid" line
+  
+    if {[regexp {define SQLITE_EXTERN extern} $line]} {
+      puts $line
+      puts [gets $in]
+      puts ""
+      puts "#ifndef SQLITE_API"
+      puts "# define SQLITE_API"
+      puts "#endif"
+      set line ""
+    }
+  
+    if {([regexp $varpattern $line] && ![regexp {^ *typedef} $line])
+     || ([regexp $declpattern $line])
+    } {
+      set line "SQLITE_API $line"
+    }
     puts $line
-    puts [gets $in]
-    puts ""
-    puts "#ifndef SQLITE_API"
-    puts "# define SQLITE_API"
-    puts "#endif"
-    set line ""
   }
-
-  if {([regexp $varpattern $line] && ![regexp {^ *typedef} $line])
-   || ([regexp $declpattern $line])
-  } {
-    set line "SQLITE_API $line"
-  }
-  puts $line
+  close $in
 }
-close $in