Documentation: move support for old compilers to CodingGuidelines

The "Try to be nice to older C compilers" text is clearly a guideline
to be borne in mind whilst coding rather than when submitting patches.

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/CodingGuidelines

@@ -112,6 +112,14 @@ For C programs:
 
  - We try to keep to at most 80 characters per line.
 
+ - We try to support a wide range of C compilers to compile git with,
+   including old ones. That means that you should not use C99
+   initializers, even if a lot of compilers grok it.
+
+ - Variables have to be declared at the beginning of the block.
+
+ - NULL pointers shall be written as NULL, not as 0.
+
  - When declaring pointers, the star sides with the variable
    name, i.e. "char *string", not "char* string" or
    "char * string".  This makes it easier to understand code

Documentation/SubmittingPatches

@@ -127,19 +127,6 @@ in templates/hooks--pre-commit.  To help ensure this does not happen,
 run git diff --check on your changes before you commit.
 
 
-(1a) Try to be nice to older C compilers
-
-We try to support a wide range of C compilers to compile
-git with. That means that you should not use C99 initializers, even
-if a lot of compilers grok it.
-
-Also, variables have to be declared at the beginning of the block
-(you can check this with gcc, using the -Wdeclaration-after-statement
-option).
-
-Another thing: NULL pointers shall be written as NULL, not as 0.
-
-
 (2) Generate your patch using git tools out of your commits.
 
 git based diff tools generate unidiff which is the preferred format.