This patch fixes the build of adb on linux.

Copied from archlinux repository:
https://git.archlinux.org/svntogit/community.git/tree/trunk/fix_build.patch?h=packages/android-tools

diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 75dcc86..867f3ec 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -25,6 +25,7 @@
 #endif
 
 #include <errno.h>
+#include <sys/syscall.h>
 
 #include <string>
 #include <vector>
@@ -831,7 +832,16 @@ static __inline__ int adb_is_absolute_host_path(const char* path) {
 
 static __inline__ unsigned long adb_thread_id()
 {
-    return (unsigned long)gettid();
+  // TODO: this function should be merged with GetThreadId
+#if defined(__BIONIC__)
+  return gettid();
+#elif defined(__APPLE__)
+  return syscall(SYS_thread_selfid);
+#elif defined(__linux__)
+  return syscall(__NR_gettid);
+#elif defined(_WIN32)
+  return GetCurrentThreadId();
+#endif
 }
 
 #endif /* !_WIN32 */
diff --git a/base/errors_unix.cpp b/base/errors</td></tr></table>
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