[PATCH] Document awk requirements

[Luca Tettamanti]

Hello,
current -git kernel fails to build with this error message:

  GEN     arch/x86/lib/inat-tables.c
  Error: Your awk doesn't support charactor-class.

mawk is installed; it appears that gawk is required, so:
---
Gnu awk is required for generating arch/x86/lib/inat-tables.c

Signed-off-by: Luca Tettamanti <kronos.it@xxxxxxxxx>
---

 Documentation/Changes |    1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/Changes b/Documentation/Changes
index 6d0f1ef..53fd218 100644
--- a/Documentation/Changes
+++ b/Documentation/Changes
@@ -49,6 +49,7 @@ o  oprofile               0.9                     # oprofiled --version
 o  udev                   081                     # udevinfo -V
 o  grub                   0.93                    # grub --version
 o  mcelog		  0.6
+o  Gnu awk                3.1.5                   # awk --version   
 
 Kernel compilation
 ==================
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