Allow programs/fuzz to be linked against pthread

Use the same mechanisms used to link other programs against pthread with
make, i.e. include common.make, and remove common code from programs/
fuzz/Makefile

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/programs/fuzz/Makefile b/programs/fuzz/Makefile
index 3b9b50d..afe80b7 100644
--- a/programs/fuzz/Makefile
+++ b/programs/fuzz/Makefile
@@ -1,40 +1,17 @@
-MBEDTLS_TEST_PATH:=../../tests/src
-MBEDTLS_TEST_OBJS:=$(patsubst %.c,%.o,$(wildcard ${MBEDTLS_TEST_PATH}/*.c ${MBEDTLS_TEST_PATH}/drivers/*.c))
+MBEDTLS_TEST_PATH:=../../tests
 
-CFLAGS ?= -O2
-WARNING_CFLAGS ?= -Wall -Wextra
 LOCAL_CFLAGS = $(WARNING_CFLAGS) -I../../tests/include -I../../include -D_FILE_OFFSET_BITS=64
-LOCAL_LDFLAGS = ${MBEDTLS_TEST_OBJS}		\
-		-L../../library			\
-		-lmbedtls$(SHARED_SUFFIX)	\
-		-lmbedx509$(SHARED_SUFFIX)	\
-		-lmbedcrypto$(SHARED_SUFFIX)
+MBEDTLS_PATH := ../..
+include ../../scripts/common.make
 
 LOCAL_CFLAGS += $(patsubst -I../%,-I../../%,$(THIRDPARTY_INCLUDES))
 
-ifndef SHARED
-DEP=../../library/libmbedcrypto.a ../../library/libmbedx509.a ../../library/libmbedtls.a
-else
-DEP=../../library/libmbedcrypto.$(DLEXT) ../../library/libmbedx509.$(DLEXT) ../../library/libmbedtls.$(DLEXT)
-endif
-
-
-DLEXT ?= so
-EXEXT=
-SHARED_SUFFIX=
+DEP=${MBEDLIBS}
 
 ifdef FUZZINGENGINE
 LOCAL_LDFLAGS += -lFuzzingEngine
 endif
 
-ifdef WINDOWS_BUILD
-LOCAL_LDFLAGS += -lbcrypt
-else
-ifeq ($(THREADING),pthread)
-LOCAL_LDFLAGS += -lpthread
-endif
-endif
-
 # A test application is built for each suites/test_suite_*.data file.
 # Application name is same as .data file's base name and can be
 # constructed by stripping path 'suites/' and extension .data.
@@ -49,9 +26,6 @@
 
 all: $(BINARIES)
 
-$(DEP):
-	$(MAKE) -C ../../library
-
 C_FILES := $(addsuffix .c,$(APPS))
 
 %.o: %.c