mips64: remove toolchain kludge

-mno-abicalls is an old kludge for some (probably) old issue.
Remove it since it's actually harmful, static busybox doesn't build with
it for a modern-ish toolchain (defaults as of this commit, uClibc
0.9.33.2 + gcc 4.5.4).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/Makefile.in

@@ -87,10 +87,6 @@ endif
 
 TARGET_CFLAGS=$(TARGET_ABI) $(TARGET_OPTIMIZATION) $(TARGET_DEBUGGING)
 
-ifeq ($(findstring yy,$(BR2_mips)$(BR2_MIPS_NABI64)),yy)
-TARGET_CFLAGS+=-fno-pic -mno-abicalls
-endif
-
 ifeq ($(BR2_LARGEFILE),y)
 TARGET_CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 endif