ws_main.py: Make --sanitized work with clang

While compiling with:
"""
CC=clang  CXX=clang++ ./b configure --sanitized
CC=clang  CXX=clang++ ./b build
"""

I got:
"""
clang: error: unknown argument '-static-libasan'; did you mean '-static-libsan'?
"""

This commit passes expected param name to clang while still passing the
other one to gcc.
With commit applied, one can successfully build and run sanitized clang-compiled
trex binaries.

Author: pespin

linux/ws_main.py

@@ -735,8 +735,11 @@ def get_link_flags(self, is_sanitized):
             base_flags += [
                 '-fsanitize=address',
                 '-fsanitize=leak',
-                '-static-libasan',
             ]
+             if self.is_clang():
+                base_flags += ['-static-libsan']
+            else:
+                base_flags += ['-static-libasan']
 
         return base_flags;
 

linux_dpdk/ws_main.py

@@ -2537,8 +2537,11 @@ def get_link_flags(self, is_sanitized):
             base_flags += [
                 '-fsanitize=address',
                 '-fsanitize=leak',
-                '-static-libasan',
             ]
+            if self.is_clang():
+                base_flags += ['-static-libsan']
+            else:
+                base_flags += ['-static-libasan']
         return base_flags