tools/expat: fix build error with ccache

Disable compilation of separate tests as it causes
a build error when combined with ccache

Fixes: 4a3f430d72 ("tools/expat: update to 2.6.0")
Signed-off-by: Koen Vandeputte <[email protected]>

tools/expat/Makefile

@@ -24,6 +24,7 @@ HOSTCC := $(HOSTCC_NOCACHE)
 HOST_CONFIGURE_ARGS += \
 	--disable-shared \
 	--without-docbook \
+	--without-tests \
 	--with-pic
 
 define Host/Uninstall