powertop: Fix build for !uclibc
* EXTRA_LDFLAGS isn't defined for !uclibc and configure fails
when it reads it unexpanded, see config.log snippet:
configure:4177: checking whether the C compiler works
configure:4199: i586-oe-linux-gcc -m32 -march=i586 --sysroot=/OE/sysroots/qemux86 -O2 -pipe -g -feliminate-unused-debug-types -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed ${EXTRA_LDFLAGS} conftest.c >&5
i586-oe-linux-gcc: error: ${EXTRA_LDFLAGS}: No such file or directory
configure:4203: $? = 1
configure:4241: result: no
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Backported from OpenEmbedded Dizzy branch, commit
c8f9b5c9a8e5179c2013f25decd6a5483df9c716.
Signed-off-by: Jens Rottmann <Jens.Rottmann@ADLINKtech.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
