cc/gcc: fix C++ headers location

In case we build the C++ compiler, we have to tell gcc where to put the C++
headers, or else it will try to # put it in prefix/tuple/include, which we
make a symlink to sysroot/usr/include during the build, and that we delete
(the symlink!) after the build, but gcc will not look in sysroot/usr/inlcude
for C++ headers by default.

Implements a fix suggested by: Bryan Hundven <bryanhundven@gmail.com>

Reported-by: Anthony Foiani <anthony.foiani@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from a0924619112015bdaa81a0a2313d21ef38607bc2)

 diff -durN glibc-ports-2.7.orig/sysdeps/unix/sysv/linux/arm/ioperm.c glibc-ports-2.7/sysdeps/unix/sysv/linux/arm/ioperm.c

 --- glibc-2.6.1.orig/glibc-ports-2.6.1/sysdeps/unix/sysv/linux/arm/ioperm.c	2005-06-10 13:12:09.000000000 +0200

 +++ glibc-2.6.1/glibc-ports-2.6.1/sysdeps/unix/sysv/linux/arm/ioperm.c	2008-05-18 16:19:45.000000000 +0200

 @@ -45,7 +45,6 @@

  #include <sys/mman.h>

  #include <linux/version.h>

 -#include <asm/page.h>

  #include <sys/sysctl.h>

  #define PATH_ARM_SYSTYPE	"/etc/arm_systype"