Ensure that all four callbacks are provided when registering a window function
tree877b52fe6201383bcd945ba1d3466b505393f611
drwxr-xr-x - .fossil-settings
-rw-r--r-- 44429 Makefile.in
-rw-r--r-- 3647 Makefile.linux-gcc
-rw-r--r-- 76081 Makefile.msc
-rw-r--r-- 14760 README.md
-rw-r--r-- 7 VERSION
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drwxr-xr-x - art
drwxr-xr-x - autoconf
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-rw-r--r-- 32990 config.sub
-rwxr-xr-x 405122 configure
-rw-r--r-- 21851 configure.ac
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - ext
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-rw-r--r-- 245160 ltmain.sh
-rw-r--r-- 1515 magic.txt
-rw-r--r-- 34885 main.mk
-rw-r--r-- 937 mkso.sh
drwxr-xr-x - mptest
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-rw-r--r-- 258 sqlite.pc.in
-rw-r--r-- 8928 sqlite3.1
-rw-r--r-- 267 sqlite3.pc.in
drwxr-xr-x - src
drwxr-xr-x - test
drwxr-xr-x - tool
drwxr-xr-x - vsixtest