Fixing detection of GNU Radio when installed in non-usual locations (e.g. /home/user/target). Now the user can tell cmake where GNU Radio is by 'cmake ../ -DGNURADIO_INSTALL_PREFIX=/home/user/target'

git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@462 64b25241-fba3-4117-9849-534c7e92360d

cmake/Modules/FindUHD.cmake

@@ -12,6 +12,7 @@ FIND_PATH(
         ${PC_UHD_INCLUDEDIR}
     PATHS /usr/local/include
           /usr/include
+          ${GNURADIO_INSTALL_PREFIX}/include
 )
 
 FIND_LIBRARY(
@@ -21,6 +22,7 @@ FIND_LIBRARY(
         ${PC_UHD_LIBDIR}
     PATHS /usr/local/lib
           /usr/lib
+          ${GNURADIO_INSTALL_PREFIX}/lib
 )
 
 INCLUDE(FindPackageHandleStandardArgs)