Removing a few more traces of libevent.

include/grpc/support/port_platform.h

@@ -53,7 +53,6 @@
 #define GPR_ARCH_32 1
 #define GPR_CPU_LINUX 1
 #define GPR_GCC_SYNC 1
-#define GPR_LIBEVENT 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_SOCKET 1
 #define GPR_POSIX_SOCKETADDR 1
@@ -64,7 +63,6 @@
 #elif defined(__linux__)
 #define GPR_CPU_LINUX 1
 #define GPR_GCC_ATOMIC 1
-#define GPR_LIBEVENT 1
 #define GPR_LINUX 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_SOCKET 1
@@ -80,7 +78,6 @@
 #elif defined(__APPLE__)
 #define GPR_CPU_POSIX 1
 #define GPR_GCC_ATOMIC 1
-#define GPR_LIBEVENT 1
 #define GPR_POSIX_LOG 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_SOCKET 1

test/build/event2.c

-/* This is only a compilation test, to see if we have libevent installed. */
-
-#include <event2/event.h>
-
-int main() {
-  event_base_new();
-  return 0;
-}

tools/dockerfile/grpc_base/Dockerfile

@@ -13,7 +13,6 @@ RUN apt-get update && apt-get install -y \
   libc6 \
   libc6-dbg \
   libc6-dev \
-  libevent-dev \
   libtool \
   make \
   strace \