gnu: Add adb.

* gnu/packages/android.scm: New file.
* gnu/packages/patches/libbase-fix-includes.patch: New file.
* gnu/packages/patches/libbase-use-own-logging.patch: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES, dist_patch_DATA): Add them.

Co-Authored-By: Marius Bakke <mbakke@fastmail.com>

gnu/packages/patches/libbase-fix-includes.patch

@@ -0,0 +1,71 @@
+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_unix.cpp
+index 296995e..48269b6 100644
+--- a/base/errors_unix.cpp
++++ b/base/errors_unix.cpp
+@@ -17,6 +17,7 @@
+ #include "android-base/errors.h"
+ 
+ #include <errno.h>
++#include <string.h>
+ 
+ namespace android {
+ namespace base {
+diff --git a/base/file.cpp b/base/file.cpp
+index da1adba..91a3901 100644
+--- a/base/file.cpp
++++ b/base/file.cpp
+@@ -20,6 +20,7 @@
+ #include <fcntl.h>
+ #include <sys/stat.h>
+ #include <sys/types.h>
++#include <string.h>
+ 
+ #include <string>
+ 
+diff --git a/base/logging.cpp b/base/logging.cpp
+index 1741871..e97c7f1 100644
+--- a/base/logging.cpp
++++ b/base/logging.cpp
+@@ -21,6 +21,7 @@
+ #include "android-base/logging.h"
+ 
+ #include <libgen.h>
++#include <string.h>
+ 
+ // For getprogname(3) or program_invocation_short_name.
+ #if defined(__ANDROID__) || defined(__APPLE__)