Revert "Move closer to the standard autotools idiom. (#3187)" (#3255)

This partially reverts commit d8463c2549.
Revert reason: version string should be updated more often.

src/main.c

@@ -33,6 +33,8 @@ extern void jv_tsd_dtoa_ctx_init();
 #include "jv.h"
 #include "jq.h"
 #include "util.h"
+#include "src/version.h"
+#include "src/config_opts.inc"
 
 int jq_testsuite(jv lib_dirs, int verbose, int argc, char* argv[]);