libsqlite3: vendor a modern version

Problem: the JSON1 extension to sqlite3 is not available
in RHEL 8 based distros.

They are enabled by default in sqlite3-3.38, or earlier with
an opt-in build option.  While Ubuntu 22.04 ships
sqlite3-3.37.2-2ubuntu0.3 which does include the JSON1 extension,
RHEL 8 / TOSS 4 ships sqlite-3.26.0-19.el8_9.x86_64 which does not.

Pull in the sqlite3 amalgomated source for 3.45.2 from here:
https://sqlite.org/download.html

License: "public domain".  See https://sqlite.org/copyright.html

Author: garlick

configure.ac

@@ -569,6 +569,7 @@ AC_CONFIG_FILES( \
   src/common/libtaskmap/Makefile \
   src/common/libfilemap/Makefile \
   src/common/libsdexec/Makefile \
+  src/common/libsqlite3/Makefile \
   src/common/libmissing/Makefile \
   src/bindings/Makefile \
   src/bindings/lua/Makefile \

src/common/Makefile.am

@@ -29,6 +29,7 @@ SUBDIRS = \
 	libtaskmap \
 	libfilemap \
 	libsdexec \
+	libsqlite3 \
 	libmissing
 
 AM_CFLAGS = $(WARNING_CFLAGS) $(CODE_COVERAGE_CFLAGS)

src/common/libsqlite3/Makefile.am

@@ -0,0 +1,15 @@
+AM_CFLAGS = \
+	$(WARNING_CFLAGS) \
+	$(CODE_COVERAGE_CFLAGS)
+
+AM_LDFLAGS = \
+	$(CODE_COVERAGE_LIBS)
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)
+
+noinst_LTLIBRARIES = libsqlite3.la
+
+libsqlite3_la_SOURCES = \
+	sqlite3.h \
+	sqlite3.c