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

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

.gitignore

@@ -18,8 +18,7 @@ jq.1
 
 # Generated source
 src/builtin.inc
-src/config.h.in
-src/config.h
+src/config_opts.inc
 *.pc
 
 # Autotools junk
@@ -41,6 +40,8 @@ jq-*.zip
 configure
 aclocal.m4
 Makefile.in
+version.h
+.remake-version-h
 config.cache
 *.rpm
 m4/libtool.m4