test/wcc: run the unit loops fully in process

000_smoke drops its popen ww -V leg (driver version parity moves to
949_driver_flagargs); 400_w6c feeds its sources through lex/parse/
check/cgen into open_memstream instead of spawning w6c. The five unit
binaries now hold zero subprocess calls.

test/wcc/000_smoke.c

@@ -1,10 +1,8 @@
 /*
  * 000_smoke — Phase 0 smoke test.
  *
- * Asserts:
- *   - libwcc symbols (newarena/amalloc/freearena, fatal/errorf/warnf)
- *     are linkable.
- *   - `ww -V` exits 0 and prints the configured version.
+ * Asserts arena allocation and growth through libwcc, plus the configured
+ * version constant.  Driver behavior belongs to the driver integration tests.
  */
 #include "ww.h"
 #include <stdlib.h>
@@ -44,44 +42,11 @@ test_version(void)
 	}
 }
 
-static void
-test_ww_minus_v(void)
-{
-	const char *bin = getenv("BIN");
-	if (bin == NULL)
-		bin = "out/bin";
-	char cmd[512];
-	snprintf(cmd, sizeof cmd, "%s/ww -V", bin);
-	FILE *p = popen(cmd, "r");
-	if (p == NULL) {
-		fprintf(stderr, "smoke: popen %s\n", cmd);
-		exit(1);
-	}
-	char buf[128];
-	size_t n = fread(buf, 1, sizeof buf - 1, p);
-	buf[n] = '\0';
-	int rc = pclose(p);
-	if (rc != 0) {
-		fprintf(stderr, "smoke: ww -V exit %d\n", rc);
-		exit(1);
-	}
-	if (strstr(buf, "ww ") != buf) {
-		fprintf(stderr, "smoke: ww -V output not 'ww ...': %s\n", buf);
-		exit(1);
-	}
-	if (strstr(buf, WW_VERSION) == NULL) {
-		fprintf(stderr, "smoke: ww -V missing version %s in: %s\n",
-		    WW_VERSION, buf);
-		exit(1);
-	}
-}
-
 int
 main(void)
 {
 	test_arena();
 	test_version();
-	test_ww_minus_v();
 	puts("smoke: ok");
 	return 0;
 }