Remove dependency on libevent (facebook#41485)

Summary:
Pull Request resolved: facebook#41485

Now that React-Hermes does not depends on folly::Futures anymore, we can safely delete the `libevent` dependency.
This will speedup the pod install step and potentially also the bundle size (to be tested)

## Changelog
[Android][Removed] - Remove libevent dependency

Reviewed By: javache

Differential Revision: D51319583

fbshipit-source-id: 155cc3632b005074c43565e7281c9873ab046f0d

packages/react-native/ReactAndroid/build.gradle

@@ -67,7 +67,6 @@ def DOUBLE_CONVERSION_VERSION = libs.versions.doubleconversion.get()
 def FMT_VERSION = libs.versions.fmt.get()
 def FOLLY_VERSION = libs.versions.folly.get()
 def GLOG_VERSION = libs.versions.glog.get()
-def LIBEVENT_VERSION = libs.versions.libevent.get()
 def GTEST_VERSION = libs.versions.gtest.get()
 
 final def preparePrefab = tasks.register("preparePrefab", PreparePrefabHeadersTask) {
@@ -326,22 +325,6 @@ task prepareFmt(dependsOn: dependenciesPath ? [] : [downloadFmt], type: Copy) {
     into("$thirdPartyNdkDir/fmt")
 }
 
-task downloadLibevent(dependsOn: createNativeDepsDirectories, type: Download) {
-    src("https://github.com/libevent/libevent/releases/download/release-${LIBEVENT_VERSION}-stable/libevent-${LIBEVENT_VERSION}-stable.tar.gz")
-    onlyIfModified(true)
-    overwrite(false)
-    retries(5)
-    dest(new File(downloadsDir, "libevent-${LIBEVENT_VERSION}.tar.gz"))
-}
-
-
-final def prepareLibevent = tasks.register("prepareLibevent", PrepareLibeventTask) {
-    it.dependsOn(dependenciesPath ? [] : [downloadLibevent])
-    it.libeventPath.setFrom(dependenciesPath ?: tarTree(downloadLibevent.dest))
-    it.libeventVersion.set(LIBEVENT_VERSION)
-    it.outputDir.set(new File(thirdPartyNdkDir, "libevent"))
-}
-
 task downloadGlog(dependsOn: createNativeDepsDirectories, type: Download) {
     src("https://github.com/google/glog/archive/v${GLOG_VERSION}.tar.gz")
     onlyIfModified(true)
@@ -603,7 +586,6 @@ android {
             prepareGlog,
             prepareGtest,
             prepareJSC,
-            prepareLibevent,
             preparePrefab
     )
     generateCodegenSchemaFromJavaScript.dependsOn(buildCodegenCLITask)

packages/react-native/ReactAndroid/hermes-engine/build.gradle

@@ -23,7 +23,7 @@ def cmakeVersion = parent.cmake_version
  * users to install CMake externally.
  */
 def findCmakePath(cmakeVersion) {
-    def cmakeRelativePath = "/cmake/${cmakeVersion}/bin/cmake"
+    def cmakeRelativePath = "cmake/${cmakeVersion}/bin/cmake"
     if (System.getenv("ANDROID_SDK_ROOT") && new File("${System.getenv("ANDROID_SDK_ROOT")}/${cmakeRelativePath}").exists()) {
         return "${System.getenv("ANDROID_SDK_ROOT")}/${cmakeRelativePath}"
     }

packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt

@@ -50,7 +50,6 @@ add_react_third_party_ndk_subdir(glog)
 add_react_third_party_ndk_subdir(boost)
 add_react_third_party_ndk_subdir(double-conversion)
 add_react_third_party_ndk_subdir(fmt)
-add_react_third_party_ndk_subdir(libevent)
 add_react_third_party_ndk_subdir(folly)
 add_react_third_party_ndk_subdir(jsc)
 add_react_third_party_ndk_subdir(googletest)