[COMMITTED] PowerPC: Fix compiler warnings

[Adhemerval Zanella]

Pushed the obvious patch to fix some compiler warnings:

---

diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S
index 0492baf..ad00f98 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S
@@ -33,7 +33,7 @@
   TRACEBACK(__strcasecmp_power7)                               \
   END_2(__strcasecmp_power7)

-#undef weak_alias(name, alias)
+#undef weak_alias
 #define weak_alias(name, alias)

 #undef libc_hidden_builtin_def
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcasecmp_l-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strcasecmp_l-power7.S
index a65949f..81ec696 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcasecmp_l-power7.S
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcasecmp_l-power7.S
@@ -33,7 +33,7 @@
   TRACEBACK(__strcasecmp_l_power7)                             \
   END_2(__strcasecmp_l_power7)

-#undef weak_alias(name, alias)
+#undef weak_alias
 #define weak_alias(name, alias)

 #undef libc_hidden_builtin_def
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strnlen-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strnlen-power7.S
index 30e29cd..057e5a8 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strnlen-power7.S
+++ b/sysdeps/powerpc/powerpc64/multiarch/strnlen-power7.S
@@ -35,7 +35,7 @@

 #undef libc_hidden_builtin_def
 #define libc_hidden_builtin_def(name)
-#undef weak_alias(name, alias)
+#undef weak_alias
 #define weak_alias(name, alias)

 #include <sysdeps/powerpc/powerpc64/power7/strnlen.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/wcscpy.c b/sysdeps/powerpc/powerpc64/multiarch/wcscpy.c
index f04298a..5c0a6d3 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/wcscpy.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/wcscpy.c
@@ -33,4 +33,4 @@ libc_ifunc (wcscpy,
              : __wcscpy_ppc);
 #else
 #include <wcsmbs/wcscpy.c>
-#endif:
+#endif