Merge the skip-scan optimization into the sessions branch.

FossilOrigin-Name: 7596d1bf8040f7cefc7b22c5e609acc5d66820bf

Makefile.in

@@ -284,7 +284,8 @@ SRC = \
   $(TOP)/src/wal.c \
   $(TOP)/src/wal.h \
   $(TOP)/src/walker.c \
-  $(TOP)/src/where.c
+  $(TOP)/src/where.c \
+  $(TOP)/src/whereInt.h
 
 # Source code for extensions
 #
@@ -474,6 +475,7 @@ HDR = \
    $(TOP)/src/sqliteLimit.h \
    $(TOP)/src/vdbe.h \
    $(TOP)/src/vdbeInt.h \
+   $(TOP)/src/whereInt.h \
    config.h
 
 # Header files used by extensions