build: Support toplevel lib and mes builds.

* build-aux/build.sh.in: Add missing libdir for gcc build.
* build-aux/config.sh.in: ...here.
* build-aux/build-mes.sh: Do not overwrite srcdest, V.

build-aux/build-mes.sh

@@ -21,7 +21,7 @@
 set -e
 set -u
 
-V=${V-1}
+V=${V-}
 
 if [ "$V" = 2 ]; then
     set -x
@@ -33,7 +33,6 @@ fi
 
 trap 'test -f .log && cat .log' EXIT
 
-srcdest=${srcdest-}
 mes_sources="
 src/gc.c
 src/hash.c

build-aux/build.sh.in

@@ -58,6 +58,9 @@ fi
         srcdir=../
     fi
     if test $compiler = gcc; then
+        AM_LDFLAGS="$AM_LDFLAGS
+-L gcc-lib
+"
         AM_CPPFLAGS="
 -D HAVE_CONFIG_H=1
 -I include