make/import: remove LDLIBS declare

which already exported in scripts/Make.defs

Change-Id: I74858632f779fc2a409c9f4afb114db14003686d
Signed-off-by: chao.an <anchao@xiaomi.com>

import/Make.defs

@@ -80,12 +80,10 @@ else
   LDLIBPATH = -L $(APPDIR) -L $(TOPDIR)$(DELIM)libs
 endif
 
-LDLIBS = -lapps -lnuttx
-
 # Try to get the path to libgcc.a.  Of course, this only works for GCC
 # toolchains.
 
-LIBGCC = "${shell "$(CC)" $(ARCHCPUFLAGS) -print-libgcc-file-name 2>/dev/null}"
+LIBGCC = ${shell "$(CC)" $(ARCHCPUFLAGS) -print-file-name=libgcc.a}
 ifneq ($(LIBGCC),)
   LDLIBPATH += -L "${shell dirname $(LIBGCC)}"
   LDLIBS += -lgcc