Move tilegx, tilepro, and linux-generic from ports to libc.

I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure.  Beyond the README
update, the move was just

    git mv ports/sysdeps/tile sysdeps/tile
    git mv ports/sysdeps/unix/sysv/linux/tile \
      sysdeps/unix/sysv/linux/tile
    git mv ports/sysdeps/unix/sysv/linux/generic \
      sysdeps/unix/sysv/linux/generic

I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.

1 files changed, 13 insertions, 0 deletions

diff --git a/sysdeps/tile/Makefile b/sysdeps/tile/Makefile
new file mode 100644
index 0000000000..3cd4d1e752
--- /dev/null
+++ b/sysdeps/tile/Makefile
@@ -0,0 +1,13 @@
+# We don't support long doubles as a distinct type.  We don't need to set
+# this variable; it's here mostly for documentational purposes.
+
+long-double-fcts = no
+
+ifeq ($(subdir),gmon)
+sysdep_routines += _mcount
+endif
+
+ifeq ($(subdir),elf)
+# Extra shared linker files to link only into dl-allobjs.so.
+sysdep-rtld-routines += dl-start __tls_get_addr
+endif