Fix building on raspberry pi. (tensorflow#2230)

configure.py

@@ -44,6 +44,10 @@ def is_windows():
     return platform.system() == "Windows"
 
 
+def is_raspi_arm():
+    return os.uname()[4] == "armv7l"
+
+
 def get_tf_header_dir():
     import tensorflow as tf
 
@@ -60,6 +64,8 @@ def get_tf_shared_lib_dir():
     if is_windows():
         tf_shared_lib_dir = tf.sysconfig.get_compile_flags()[0][2:-7] + "python"
         return tf_shared_lib_dir.replace("\\", "/")
+    elif is_raspi_arm():
+        return tf.sysconfig.get_compile_flags()[0][2:-7] + "python"
     else:
         return tf.sysconfig.get_link_flags()[0][2:]
 
@@ -75,6 +81,9 @@ def get_shared_lib_name():
     elif is_windows():
         # Windows
         return "_pywrap_tensorflow_internal.lib"
+    elif is_raspi_arm():
+        # The below command for linux would return an empty list
+        return "_pywrap_tensorflow_internal.so"
     else:
         # Linux
         return namespec[1][3:]