delete compiling macros

cmake/external_libs/gflags.cmake

@@ -10,7 +10,7 @@ if ((${CMAKE_INSTALL_PREFIX} STREQUAL /usr/local) OR
     message(STATUS "No install prefix selected, default to ${CMAKE_INSTALL_PREFIX}.")
 endif()
 if (GE_PB_PKG)
-    set(REQ_URL "${GE_PB_PKG}/libs/gflags/v2.2.2.tar.gz"")
+    set(REQ_URL "${GE_PB_PKG}/libs/gflags/v2.2.2.tar.gz")
     set(MD5 "")
 else()
     if (ENABLE_GITEE)