Merge trunk 3.8.8 beta changes into the sessions branch

FossilOrigin-Name: 0ba124540b5b2a9ceda0f4f4a46e6be54edad813

main.mk

@@ -115,6 +115,7 @@ SRC = \
   $(TOP)/src/mem3.c \
   $(TOP)/src/mem5.c \
   $(TOP)/src/memjournal.c \
+  $(TOP)/src/msvc.h \
   $(TOP)/src/mutex.c \
   $(TOP)/src/mutex.h \
   $(TOP)/src/mutex_noop.c \
@@ -353,6 +354,7 @@ HDR = \
    $(TOP)/src/hash.h \
    $(TOP)/src/hwtime.h \
    keywordhash.h \
+   $(TOP)/src/msvc.h \
    $(TOP)/src/mutex.h \
    opcodes.h \
    $(TOP)/src/os.h \