flex-array: simplify compiler-specific workaround

We use "type array[];" syntax for the flex-array member at the end
of a struct under C99 or later, except when we are building with
older SUNPRO_C compilers.  As we find more vendor compilers that
claim to grok C99 but not understand the flex-array syntax, the
existing "If we are using C99, but not with these compilers..."
conditional will keep growing.

Make it more manageable by listing vendor-specific exceptions
earlier, with the expectation that new exceptions will not be
combined into existing ones to make the condition longer, and
instead will be implemented as a new "#elif" in the cascade of
similar to old SUNPRO_C, we can just add a single line

    #elif defined(_MSC_VER)

immediately before "#elif defined(__GNUC__)" to cause us to fallback
to the safer but a bit wasteful version.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-compat-util.h

@@ -33,14 +33,23 @@
 /*
  * See if our compiler is known to support flexible array members.
  */
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
-# define FLEX_ARRAY /* empty */
+
+/*
+ * Check vendor specific quirks first, before checking the
+ * __STDC_VERSION__, as vendor compilers can lie and we need to be
+ * able to work them around.  Note that by not defining FLEX_ARRAY
+ * here, we can fall back to use the "safer but a bit wasteful" one
+ * later.
+ */
+#if defined(__SUNPRO_C) && (__SUNPRO_C <= 0x580)
 #elif defined(__GNUC__)
 # if (__GNUC__ >= 3)
 #  define FLEX_ARRAY /* empty */
 # else
 #  define FLEX_ARRAY 0 /* older GNU extension */
 # endif
+#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+# define FLEX_ARRAY /* empty */
 #endif
 
 /*