[m-rev.] diff: update some README files

[Julien Fischer]

Branches: main, 11.07

Update some documentation

README.Erlang:
 	Mention the minimum required version of Erlang/OTP.

README.MacOS:
 	Mention that with XCode 4 gcc is actually a symlink for llvm-gcc.

Julien.

Index: README.Erlang
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/README.Erlang,v
retrieving revision 1.8
diff -u -r1.8 README.Erlang
--- README.Erlang	10 Jan 2011 06:40:24 -0000	1.8
+++ README.Erlang	20 Dec 2011 06:36:14 -0000
@@ -167,7 +167,7 @@

  Q. What version of Erlang should I be using?

-A. We have tested with Erlang/OTP R11-R3 and up.
+A. Erlang/OTP R14B04 or later is required.


  Q. What features are not yet implemented for the Erlang back-end?
Index: README.MacOS
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/README.MacOS,v
retrieving revision 1.22
diff -u -r1.22 README.MacOS
--- README.MacOS	2 Dec 2011 05:04:21 -0000	1.22
+++ README.MacOS	20 Dec 2011 06:36:14 -0000
@@ -8,7 +8,8 @@
  The default C compiler provided in XCode 4 is llvm-gcc.
  Mercury does NOT work with llvm-gcc.  In order to build Mercury you will either
  need to use one of the other C compilers available on the system, either GCC
-4.2 or clang.
+4.2 or clang.  With XCode 4 "gcc" is actually a symbolic link for llvm-gcc; the
+GCC 4.2 executable is named "gcc-4.2".

  Alternatively, the MacPorts project, <http://www.macports.org/>, provides more
  recent versions of GCC for Mac OS X.

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