Revert "runtime: correct GoCheckBindM's C declaration in EnsureBindM test"

This reverts CL 482975.

Reason for revert: CL 481061 causes C TSAN failures and must be
reverted. See CL 485275. This CL depends on CL 481061.

For #59678.

Change-Id: I4599e93d536149bcec94a5a1542533107699514f
Reviewed-on: https://go-review.googlesource.com/c/go/+/485317
Reviewed-by: Than McIntosh <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Michael Pratt <[email protected]>
Auto-Submit: Michael Pratt <[email protected]>

Author: prattmic

src/runtime/testdata/testprogcgo/bindm.c

@@ -10,7 +10,35 @@
 package main
 
 /*
-extern void CheckBindM();
+#include <stdint.h>
+#include <pthread.h>
+#include <unistd.h>
+
+extern void GoCheckBindM();
+
+#define CTHREADS 2
+#define CHECKCALLS 100
+
+static void* checkBindMThread(void* thread) {
+	int i;
+	for (i = 0; i < CHECKCALLS; i++) {
+		GoCheckBindM((uintptr_t)thread);
+		usleep(1);
+	}
+	return NULL;
+}
+
+static void CheckBindM() {
+	int i;
+	pthread_t s[CTHREADS];
+
+	for (i = 0; i < CTHREADS; i++) {
+		pthread_create(&s[i], NULL, checkBindMThread, &s[i]);
+	}
+	for (i = 0; i < CTHREADS; i++) {
+		pthread_join(s[i], NULL);
+	}
+}
 */
 import "C"