_CFLAGS in part by removing all the -I
switches.  This is so that kernel headers don't accidentally get pulled into
libc files.  However, a common use of command-line CFLAGS would be to add -I
switches to the build.  This patch specifically adds any command-line -I flags
back to USER_CFLAGS.

I also corrected the spelling of LFLAGS to LDFLAGS.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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