Merge branch 'mk/http-backend-content-length'

The http-backend (used for smart-http transport) used to slurp the
whole input until EOF, without paying attention to CONTENT_LENGTH
that is supplied in the environment and instead expecting the Web
server to close the input stream.  This has been fixed.

* mk/http-backend-content-length:
  t5562: avoid non-portable "export FOO=bar" construct
  http-backend: respect CONTENT_LENGTH for receive-pack
  http-backend: respect CONTENT_LENGTH as specified by rfc3875
  http-backend: cleanup writing to child process

help.c

@@ -693,6 +693,7 @@ int cmd_version(int argc, const char **argv, const char *prefix)
 		else
 			printf("no commit associated with this build\n");
 		printf("sizeof-long: %d\n", (int)sizeof(long));
+		printf("sizeof-size_t: %d\n", (int)sizeof(size_t));
 		/* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
 	}
 	return 0;