fix sanitizer build

# Clang sanitizer compiler options

ifeq "$(CLANG)" "1"

CC       = $(CCCLANG)

CC       = clang

CFLAGS  += -fsanitize=memory

LDFLAGS += -fsanitize=memory

endif

ifeq "$(CLANG)" "2"

CC       = $(CCCLANG)

CC       = clang

CFLAGS  += -fsanitize=address

LDFLAGS += -fsanitize=address

endif

ifeq "$(CLANG)" "3"

CC       = $(CCCLANG) 

CC       = clang

# NOTE: keep in sync with list in CMakeLists.txt

usan_checks = undefined,float-divide-by-zero,implicit-conversion,local-bounds

CFLAGS  += -fsanitize=$(usan_checks)