package/lz4: fix static build

Fix the following static build failure raised since bump to version
1.9.4 in commit 1f54af8c4f814bfc0993756b82575ad581ce5318:

compiling dynamic library 1.9.4
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/m68k-buildroot-uclinux-uclibc/bin/ld.real: /home/giuliobenetti/autobuild/run/instance-0/output-1/host/m68k-buildroot-uclinux-uclibc/sysroot/usr/lib/crt1.o: in function `_start':
(.text+0x1c): undefined reference to `main'

Fixes:
 - http://autobuild.buildroot.org/results/9187852fb7a869bf5595275d47929632659a4407

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/lz4/0001-build-Support-BUILD_SHARED-no.patch

@@ -0,0 +1,42 @@
+From 5ccbd38277989ae6a728171d59ae03bad6f2f4d5 Mon Sep 17 00:00:00 2001
+From: Fotis Xenakis <foxen@windowslive.com>
+Date: Tue, 13 Sep 2022 20:09:36 +0300
+Subject: [PATCH] build: Support BUILD_SHARED=no
+
+Since e585a438c714652e866a59371b287f52aa4d2dc3, the BUILD_SHARED
+Makefile variable only takes effect for the install target (i.e. the
+shared libraries always built). This restores the original behaviour.
+
+[Retrieved from:
+https://github.com/lz4/lz4/commit/5ccbd38277989ae6a728171d59ae03bad6f2f4d5]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ lib/Makefile | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/lib/Makefile b/lib/Makefile
+index 06503cb2a..ee262c0df 100644
+--- a/lib/Makefile
++++ b/lib/Makefile
+@@ -112,17 +112,21 @@ liblz4-dll.o: liblz4-dll.rc
+ 	$(WINDRES) -i liblz4-dll.rc -o liblz4-dll.o
+ 
+ $(LIBLZ4): $(SRCFILES) liblz4-dll.o
++ifeq ($(BUILD_SHARED),yes)
+ 	@echo compiling dynamic library $(LIBVER)
+ 	$(CC) $(FLAGS) -DLZ4_DLL_EXPORT=1 -shared $^ -o dll/$@.dll -Wl,--out-implib,dll/$(LIBLZ4_EXP)
++endif
+ 
+ else   # not windows
+ 
+ $(LIBLZ4): $(SRCFILES)
++ifeq ($(BUILD_SHARED),yes)
+ 	@echo compiling dynamic library $(LIBVER)
+ 	$(CC) $(FLAGS) -shared $^ -fPIC -fvisibility=hidden $(SONAME_FLAGS) -o $@
+ 	@echo creating versioned links
+ 	$(LN_SF) $@ liblz4.$(SHARED_EXT_MAJOR)
+ 	$(LN_SF) $@ liblz4.$(SHARED_EXT)
++endif
+ 
+ endif
+