libknot: remove lmdb_LIBS from the pkg-config file if embedded LMDB is used

fixes #615

configure.ac

@@ -466,12 +466,14 @@ AS_IF([test "$with_lmdb" != "no"],[
 AS_IF([test "$have_lmdb" != "no"],[
     AC_SUBST([lmdb_LIBS])
     enable_lmdb=shared
+    external_lmdb_LIBS=$lmdb_LIBS
     ],[
     enable_lmdb=embedded
     lmdb_CFLAGS="-I\$(top_srcdir)/src/contrib/lmdb"
     ])
 AM_CONDITIONAL([HAVE_LMDB], test "$enable_lmdb" = "shared")
 AC_SUBST([lmdb_CFLAGS])
+AC_SUBST([external_lmdb_LIBS])
 
 # LMDB mapping sizes
 conf_mapsize_default=500

src/libknot.pc.in

@@ -9,5 +9,5 @@ URL: https://www.knot-dns.cz
 Version: @PACKAGE_VERSION@
 Requires.private: libdnssec = @PACKAGE_VERSION@
 Libs: -L${libdir} -lknot
-Libs.private: -lm @lmdb_LIBS@
-Cflags: -I${includedir} @lmdb_CFLAGS@
+Libs.private: -lm @external_lmdb_LIBS@
+Cflags: -I${includedir}