Clean up base-library structure

This patch moves the base library from src/base to src/lib/base,
flattens the library-internal directory structure, and moves the common
parts of the library-description files to base/lib/mk/base.inc and
base/lib/mk/base-common.inc.

Furthermore, the patch fixes a few cosmetic issues (whitespace and
comments only) that I encountered while browsing the result.

Fixes #1952

repos/base-linux/src/core/target.mk

@@ -26,7 +26,8 @@ SRC_CC        = main.cc \
                 thread_linux.cc \
                 stack_area.cc \
                 core_printf.cc \
-                thread.cc myself.cc
+                env_reinit.cc \
+                thread.cc thread_myself.cc
 
 INC_DIR      += $(REP_DIR)/src/core/include \
                 $(GEN_CORE_DIR)/include \
@@ -48,8 +49,9 @@ vpath platform_services.cc        $(GEN_CORE_DIR)
 vpath signal_source_component.cc  $(GEN_CORE_DIR)
 vpath trace_session_component.cc  $(GEN_CORE_DIR)
 vpath core_rpc_cap_alloc.cc       $(GEN_CORE_DIR)
-vpath core_printf.cc              $(BASE_DIR)/src/base/console
-vpath thread.cc                   $(BASE_DIR)/src/base/thread
-vpath myself.cc                   $(BASE_DIR)/src/base/thread
-vpath trace.cc                    $(BASE_DIR)/src/base/thread
+vpath core_printf.cc              $(BASE_DIR)/src/lib/base
+vpath thread.cc                   $(BASE_DIR)/src/lib/base
+vpath thread_myself.cc            $(BASE_DIR)/src/lib/base
+vpath trace.cc                    $(BASE_DIR)/src/lib/base
+vpath env_reinit.cc               $(REP_DIR)/src/lib/base
 vpath %.cc                        $(PRG_DIR)

repos/base-linux/src/include/base/internal/platform_env.h

@@ -401,13 +401,8 @@ class Genode::Platform_env_base : public Env_deprecated
 		Pd_session             *pd_session()      override { return &_local_pd_session; }
 		Pd_session_capability   pd_session_cap()  override { return  _pd_session_cap; }
 
-		/*
-		 * Support functions for implementing fork on Noux.
-		 *
-		 * Not supported on Linux.
-		 */
-		void reinit(Native_capability::Dst, long) override { }
-		void reinit_main_thread(Capability<Region_map> &) override { }
+		void reinit(Native_capability::Dst, long) override;
+		void reinit_main_thread(Capability<Region_map> &) override;
 };
 
 

repos/base-linux/src/lib/base/env_reinit.cc

@@ -0,0 +1,24 @@
+/*
+ * \brief  Environment reinitialization
+ * \author Norman Feske
+ * \date   2016-04-29
+ *
+ * Support functions for implementing fork on Noux, which is not supported on
+ * Linux.
+ */
+
+/*
+ * Copyright (C) 2016 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+/* base-internal includes */
+#include <base/internal/platform_env.h>
+
+
+void Genode::Platform_env_base::reinit(Native_capability::Dst, long) { }
+
+
+void Genode::Platform_env_base::reinit_main_thread(Capability<Region_map> &) { }