[git commit 0_9_30] add comment why do we need _ISbit() macro

[Denis Vlasenko]

commit: http://git.uclibc.org/uClibc/commit/?id=67082dd1cfdca75c927937fab617fbb3b1656d9e
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/0_9_30

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
---
 include/ctype.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/ctype.h b/include/ctype.h
index 184b47b..8458d72 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -36,6 +36,7 @@ __BEGIN_DECLS
    If there get to be more than 16 distinct characteristics,
    __ctype_mask_t will need to be adjusted. */
 
+/* libstdc++ from gcc toolchain needs this macro. */
 # define _ISbit(bit)	(1 << (bit))
 
 enum
-- 
1.6.3.3