Update build_armv7a.sh

修复arm64未打出so问题

Author: neilyhe

.github/script/build_armv7a.sh

@@ -4,10 +4,14 @@
 ./init-android.sh
 
 cd android/contrib
+./compile-openssl.sh clean
 ./compile-openssl.sh armv7a
-./compile-openssl.sh arm64
 ./compile-ffmpeg.sh clean
 ./compile-ffmpeg.sh armv7a
+
+./compile-openssl.sh clean
+./compile-openssl.sh arm64
+./compile-ffmpeg.sh clean
 ./compile-ffmpeg.sh arm64
 cd ..
 ./compile-ijk.sh armv7a