squashfs3: fix build when zlib isn't available on the host

We need to pass CFLAGS and LDFLAGS, and to rename the patch so that it
actually gets applied.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/squashfs3/squashfs3-3.4-build-system-fix.patch

@@ -9,9 +9,9 @@ Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
 
 Index: squashfs3.4/squashfs-tools/Makefile
 ===================================================================
---- squashfs3.4.orig/squashfs-tools/Makefile
+--- squashfs3.4.orig/squashfs-tools/Makefile	2008-08-26 09:10:13.000000000 +0200
-+++ squashfs3.4/squashfs-tools/Makefile
++++ squashfs3.4/squashfs-tools/Makefile	2010-05-06 21:09:28.000000000 +0200
-@@ -2,12 +2,12 @@ INSTALL_DIR = /usr/local/bin
+@@ -2,12 +2,12 @@
  
  INCLUDEDIR = .
  
@@ -26,3 +26,12 @@ Index: squashfs3.4/squashfs-tools/Makefile
  
  mksquashfs.o: mksquashfs.c squashfs_fs.h mksquashfs.h global.h sort.h
  
+@@ -16,7 +16,7 @@
+ sort.o: sort.c squashfs_fs.h global.h sort.h
+ 
+ unsquashfs: unsquashfs.o
+-	$(CC) unsquashfs.o -lz -lpthread -lm -o $@
++	$(CC) $(LDFLAGS) unsquashfs.o -lz -lpthread -lm -o $@
+ 
+ unsquashfs.o: unsquashfs.c squashfs_fs.h read_fs.h global.h
+ 

package/squashfs3/squashfs3.mk

@@ -18,7 +18,7 @@ define SQUASHFS3_INSTALL_TARGET_CMDS
 endef
 
 define HOST_SQUASHFS3_BUILD_CMDS
- $(HOST_MAKE_ENV) $(MAKE) -C $(@D)/squashfs-tools/
+ $(HOST_MAKE_ENV) $(MAKE) CFLAGS="$(HOST_CFLAGS)" LDFLAGS="$(HOST_LDFLAGS)" -C $(@D)/squashfs-tools/
 endef
 
 define HOST_SQUASHFS3_INSTALL_CMDS