Remove _(GNU|XOPEN)_SORUCE makefile cruft.

None of the functions needing these are used.

Change-Id: Ibe3ca24d993788bf2f1108bac8417a7094ef386b
diff --git a/minadbd/Android.mk b/minadbd/Android.mk
index dce004f..24b043e 100644
--- a/minadbd/Android.mk
+++ b/minadbd/Android.mk
@@ -13,8 +13,6 @@
     -Wall -Werror \
     -Wno-unused-parameter \
     -Wimplicit-function-declaration \
-    -D_GNU_SOURCE \
-    -D_XOPEN_SOURCE \
     -DADB_HOST=0 \
 
 LOCAL_C_INCLUDES := bootable/recovery system/core/adb