Update cmake files from gnuradio master gr_modtool output.

I ran gr_modtool to create a new module. Then replaces the top level
CMakeLists file and tweaked the details. Also about the cmake Modules.
The output compiles for x86 native and armv7a cross.

Signed-off-by: Philip Balister <philip@balister.org>

cmake/Modules/GrTest.cmake

@@ -30,6 +30,7 @@ set(__INCLUDED_GR_TEST_CMAKE TRUE)
 # GR_TEST_TARGET_DEPS  - built targets for the library path
 # GR_TEST_LIBRARY_DIRS - directories for the library path
 # GR_TEST_PYTHON_DIRS  - directories for the python path
+# GR_TEST_ENVIRONS  - other environment key/value pairs
 ########################################################################
 function(GR_ADD_TEST test_name)
 
@@ -65,7 +66,8 @@ function(GR_ADD_TEST test_name)
     file(TO_NATIVE_PATH "${GR_TEST_LIBRARY_DIRS}" libpath) #ok to use on dir list?
     file(TO_NATIVE_PATH "${GR_TEST_PYTHON_DIRS}" pypath) #ok to use on dir list?
 
-    set(environs "GR_DONT_LOAD_PREFS=1" "srcdir=${srcdir}")
+    set(environs "VOLK_GENERIC=1" "GR_DONT_LOAD_PREFS=1" "srcdir=${srcdir}")
+    list(APPEND environs ${GR_TEST_ENVIRONS})
 
     #http://www.cmake.org/pipermail/cmake/2009-May/029464.html
     #Replaced this add test + set environs code with the shell script generation.
@@ -89,7 +91,11 @@ function(GR_ADD_TEST test_name)
         list(APPEND environs "PATH=${binpath}" "${LD_PATH_VAR}=${libpath}" "PYTHONPATH=${pypath}")
 
         #generate a bat file that sets the environment and runs the test
-        find_program(SHELL sh)
+	if (CMAKE_CROSSCOMPILING)
+                set(SHELL "/bin/sh")
+        else(CMAKE_CROSSCOMPILING)
+                find_program(SHELL sh)
+        endif(CMAKE_CROSSCOMPILING)
         set(sh_file ${CMAKE_CURRENT_BINARY_DIR}/${test_name}_test.sh)
         file(WRITE ${sh_file} "#!${SHELL}\n")
         #each line sets an environment variable