cc/gcc: diable libsanitizer without NPTL

gcc-4.8 comes with a new library to sanitise memory access:
- heap-, stack-, and global-buffer overflow, use-after-free
- data-races between threads

This library requires some _np parts of the API, which are not
implemented in the (old) LinuxThreads, which is still available
in uClibc.

Since NPTL requires a i486 or above, i386 are stuck with using LT,
which precludes building the libsanitizer.

Disable libsanitizer, a bit like libatomic is.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Niels Penneman <niels@penneman.org>

CT_LOCAL_TARBALLS_DIR="${HOME}/src"

CT_SAVE_TARBALLS=y

CT_LOG_EXTRA=y

CT_ARCH_FLOAT_SW=y

CT_ARCH_powerpc=y

CT_KERNEL_linux=y

CT_KERNEL_V_2_6_31=y

CT_BINUTILS_V_2_19_1a=y

CT_BINUTILS_FOR_TARGET=y

CT_CC_V_4_2_4=y

CT_CC_LANG_FORTRAN=y

CT_CC_LANG_CXX=y

CT_LIBC_uClibc=y

CT_LIBC_UCLIBC_V_0_9_30_1=y

CT_LIBC_UCLIBC_CONFIG_FILE="${CT_LIB_DIR}/samples/${CT_TARGET}/${CT_LIBC}-${CT_LIBC_VERSION}.config"

CT_DEBUG_dmalloc=y

CT_DEBUG_duma=y

CT_DEBUG_gdb=y

CT_GDB_NATIVE=y

CT_GDB_V_6_8a=y

CT_DEBUG_strace=y

CT_STRACE_V_4_5_19=y

CT_GMP_V_4_3_2=y

CT_MPFR_V_2_4_2=y