use $(LIBLZMA_LIBS) instead of -llzma

This is needed in case of non-standard lzma installation path that will
be specified in pkgconfig manifest as extra -L option for LDFLAGS.

Makefile.config.in

@@ -10,6 +10,7 @@ OPENSSL_LIBS = @OPENSSL_LIBS@
 PACKAGE_NAME = @PACKAGE_NAME@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 SODIUM_LIBS = @SODIUM_LIBS@
+LIBLZMA_LIBS = @LIBLZMA_LIBS@
 SQLITE3_LIBS = @SQLITE3_LIBS@
 bash = @bash@
 bindir = @bindir@

src/libutil/local.mk

@@ -6,6 +6,6 @@ libutil_DIR := $(d)
 
 libutil_SOURCES := $(wildcard $(d)/*.cc)
 
-libutil_LDFLAGS = -llzma -lbz2 -pthread $(OPENSSL_LIBS)
+libutil_LDFLAGS = $(LIBLZMA_LIBS) -lbz2 -pthread $(OPENSSL_LIBS)
 
 libutil_LIBS = libformat