libbsd: fix libpath to not use host path

libpath.so uses host path in ld script causing other packages fail to
cross compile, e.g. perl:
"ld: cannot find /usr/lib/libbsd.so.0.11.6: No such file or directory"

Fixes: openwrt/packages#19390

Signed-off-by: Xuefer H <xuefer@gmail.com>

package/libs/libbsd/Makefile

@@ -14,6 +14,7 @@ PKG_LICENSE_FILES:=COPYING
 PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1
 PKG_BUILD_DEPENDS := libmd
+PKG_FIXUP:=autoreconf
 
 include $(INCLUDE_DIR)/package.mk
 

package/libs/libbsd/patches/001-fix-libpath.patch

@@ -0,0 +1,13 @@
+do not use host path to fix cross compiling
+
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -160,7 +160,7 @@
+ 	(echo '/* GNU ld script'; \
+ 	 echo ' * The MD5 functions are provided by the libmd library. */'; \
+ 	 cat format.ld; \
+-	 echo "GROUP($(runtimelibdir)/$$soname AS_NEEDED($(MD5_LIBS)))"; \
++	 echo "GROUP($$soname AS_NEEDED($(MD5_LIBS)))"; \
+ 	)>$(DESTDIR)$(libdir)/libbsd.so
+ else
+ 	if [ "$(libdir)" != "$(runtimelibdir)" ]; then \