sdk-image: Fix wrapping of gcc binaries in libexec/
sdk-image: Fix wrapping of gcc binaries in libexec/

Without this, gcc might fail with something like this:

    .arm-cortexa7t-linux-gnueabi-gcc: error trying to exec '/home/user/sdk/bin/../libexec/gcc/arm-cortexa7t-linux-gnueabi/4.9.2/cc1': execv: No such file or directory

Fx. when running an i686 SDK on an x86_64 host without multilib/multiarch
support.

Signed-off-by: Esben Haabendal <da90c138e4a9573086862393cde34fa33d74f6e5@haabendal.dk>

sknsean/core,sknsean/core,hundeboll/core,sknsean/core,hundeboll/core,hundeboll/core,diorcety/oe-lite-core,sknsean/core,sknsean/core,hundeboll/core,diorcety/oe-lite-core