Check for both __ARM_NEON and __ARM_FEATURE_FMA so that the project can be compiled for armv7a.

Android armeabi-v7a's NEON support doesn't support FMA unless configured with `-mfpu=neon-fp-armv8`, which would need runtime checks.
* Also removed ABI filter from Android project.

examples/whisper.android/.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

examples/whisper.android/app/build.gradle

@@ -14,10 +14,6 @@ android {
         versionCode 1
         versionName "1.0"
 
-        ndk {
-            abiFilters 'arm64-v8a', 'x86_64'
-        }
-
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {
             useSupportLibrary true