CMake: build all targets in the same directory, so that "hamcore.se2" doesn't have to be copied for each of them

.travis.yml

@@ -58,7 +58,7 @@ matrix:
       script:
         - ./configure
         - make -C tmp
-        - otool -L build/vpnserver/vpnserver
+        - otool -L build/vpnserver
         - sudo make -C tmp install
 
 addons:
@@ -83,6 +83,6 @@ script:
   - export LDFLAGS="-L${HOME}/opt/lib"
   - ./configure
   - make -C tmp
-  - ldd build/vpnserver/vpnserver
+  - ldd build/vpnserver
   - sudo LD_LIBRARY_PATH="${HOME}/opt/lib:${LD_LIBRARY_PATH:-}" make -C tmp install
   - if [ "${BUILD_DEB}" = "1" ]; then make package -C tmp; fi