Pass LDFLAGS while creating binaries.

Fixes following linking error with uClibc-ng:
br/output/host/usr/lib/gcc/powerpc-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-fde-dip.o): In function `_Unwind_Find_FDE':
br/output/build/host-gcc-final-5.4.0/build/powerpc-buildroot-linux-uclibc/libgcc/../../../libgcc/unwind-dw2-fde-dip.c:465: undefined reference to `dl_iterate_phdr'
collect2: error: ld returned 1 exit status

Since uClibc-ng 1.0.18 a circular dependency between libc and libgcc
exist, when static linking is used. It can be resolved by the compiler
when -static is correctly passed in the linking step.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

diff -Nur SDL_mixer-1.2.12.orig/Makefile.in SDL_mixer-1.2.12/Makefile.in
--- SDL_mixer-1.2.12.orig/Makefile.in	2012-01-15 23:01:04.000000000 +0100
+++ SDL_mixer-1.2.12/Makefile.in	2016-12-07 08:29:22.479786596 +0100
@@ -66,10 +66,10 @@
 	$(LIBTOOL) --mode=link $(CC) -o $@ $(OBJECTS) $(VERSION_OBJECTS) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LT_LDFLAGS)
 
 $(objects)/playwave$(EXE): $(objects)/playwave.lo $(objects)/$(TARGET)
-	$(LIBTOOL) --mode=link $(CC) -o $@ $(objects)/playwave.lo $(SDL_CFLAGS) $(SDL_LIBS) $(objects)/$(TARGET)
+	$(LIBTOOL) --mode=link $(CC) -o $@ $(objects)/playwave.lo $(SDL_CFLAGS) $(SDL_LIBS) $(LDFLAGS) $(objects)/$(TARGET)
 
 $(objects)/playmus$(EXE): $(objects)/playmus.lo $(objects)/$(TARGET)
-	$(LIBTOOL) --mode=link $(CC) -o $@ $(objects)/playmus.lo $(SDL_CFLAGS) $(SDL_LIBS) $(objects)/$(TARGET)
+	$(LIBTOOL) --mode=link $(CC) -o $@ $(objects)/playmus.lo $(SDL_CFLAGS) $(SDL_LIBS) $(LDFLAGS) $(objects)/$(TARGET)
 
 install: all install-hdrs install-lib #install-bin
 install-hdrs: