leaks in the command-line shell. Add a clang analysis of the command-line
shell to the "warnings-clang.sh" script. Other minor cleanups to the
command-line shell code.
FossilOrigin-Name: 93a0f452a7023898ad3d62ee81b39a80477c332f
warnings with either gcc or clang even including FTS4 and RTREE and
both with and without SQLITE_THREADSAFE=0.
FossilOrigin-Name: 39408702a989f907261c298bf0947f3e68bd10fe
