upgrade protobuf version to 3.5.0 to fix problem in compiling with musl lib

cmake/configure.cmake

@@ -54,9 +54,6 @@ endif(WIN32)
 if(WITH_MUSL)
     add_definitions(-DPADDLE_WITH_MUSL)
 
-    message(STATUS, "WITH_CRYPTO=OFF, when WITH_MUSL=ON")
-    SET(WITH_CRYPTO OFF)
-    
     message(STATUS, "WITH_MKL=OFF, when WITH_MUSL=ON")
     SET(WITH_MKL OFF)
 

cmake/external/protobuf.cmake

@@ -199,7 +199,6 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
     ENDIF()
 
     SET(PROTOBUF_REPOSITORY  https://github.com/protocolbuffers/protobuf.git)
-    #SET(PROTOBUF_TAG         9f75c5aa851cd877fb0d93ccc31b8567a6706546)
     SET(PROTOBUF_TAG         2761122b810fe8861004ae785cc3ab39f384d342)
 
     cache_third_party(${TARGET_NAME}
@@ -235,7 +234,6 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
     )
 ENDFUNCTION()
 
-#SET(PROTOBUF_VERSION 3.1.0)
 SET(PROTOBUF_VERSION 3.5.0)
 
 IF(NOT PROTOBUF_FOUND)