Merge base libraries into a single library

This patch simplifies the way of how Genode's base libraries are
organized. Originally, the base API was implemented in the form of many
small libraries such as 'thread', 'env', 'server', etc. Most of them
used to consist of only a small number of files. Because those libraries
are incorporated in any build, the checking of their inter-dependencies
made the build process more verbose than desired. Also, the number of
libraries and their roles (core only, non-core only, shared by both core
and non-core) were not easy to capture.

Hereby, the base libraries have been reduced to the following few
libraries:

- startup.mk contains the startup code for normal Genode processes.
  On some platform, core is able to use the library as well.
- base-common.mk contains the parts of the base library that are
  identical by core and non-core processes.
- base.mk contains the complete base API implementation for non-core
  processes

Consequently, the 'LIBS' declaration in 'target.mk' files becomes
simpler as well. In the most simple case, only the 'base' library must
be mentioned.

Fixes #18

gems/src/server/d3m/target.mk

@@ -1,4 +1,4 @@
 TARGET   = d3m
 SRC_CC   = main.cc
-LIBS     = cxx env signal server child
+LIBS     = base
 INC_DIR += $(PRG_DIR)

gems/src/server/http_block/target.mk

@@ -1,5 +1,4 @@
 TARGET = http_block
 SRC_CC = main.cc http.cc
-
-LIBS   = signal server cxx env lwip libc
+LIBS   = lwip libc
 

gems/src/server/tcp_terminal/target.mk

@@ -1,3 +1,3 @@
 TARGET = tcp_terminal
 SRC_CC = main.cc
-LIBS   = env cxx server libc libc_lwip_nic_dhcp libc_log libc_lock_pipe
+LIBS   = libc libc_lwip_nic_dhcp libc_log libc_lock_pipe

gems/src/server/terminal/target.mk

@@ -1,4 +1,4 @@
 TARGET  = terminal
-LIBS    = cxx env server signal
 SRC_CC  = main.cc
+LIBS    = base
 SRC_BIN = $(notdir $(wildcard $(PRG_DIR)/*.tff))