gcc: disable libsanitizer for musl

A build issue affects libsanitizer on musl toolchains, even with
previous versions of gcc such as 4.8.x, so we disable building
libsanitizer when working with musl.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/gcc.mk

@@ -122,8 +122,9 @@ ifneq ($(BR2_TOOLCHAIN_BUILDROOT_WCHAR),y)
 HOST_GCC_COMMON_CONF_OPT += --disable-libquadmath
 endif
 
-# libsanitizer requires wordexp, not in default uClibc config
-ifeq ($(BR2_TOOLCHAIN_BUILDROOT_UCLIBC),y)
+# libsanitizer requires wordexp, not in default uClibc config. Also
+# doesn't build properly with musl.
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_UCLIBC)$(BR2_TOOLCHAIN_BUILDROOT_MUSL),y)
 HOST_GCC_COMMON_CONF_OPT += --disable-libsanitizer
 endif