Add language in installation step of the cmakecheck job

Author: harrisonmutai-arm

.travis.yml

@@ -109,7 +109,7 @@ matrix:
               ':!*tests/*' ':!*targets/*' ':!*TARGET_*' ':!*unsupported/*' \
               ':!*events/tests/*' ':!*drivers/tests/*'
 
-        ### Docs Tests ###
+    ### Docs Tests ###
     - &docs-vm
       stage: "Docs"
       name: "astyle"
@@ -346,6 +346,7 @@ matrix:
       stage: "Extended"
       name: "cmakecheck"
       env: NAME=cmakecheck
+      language: python
       python: 3.7
       install:
         # Install python modules
@@ -356,6 +357,6 @@ matrix:
       script:
         # Validate MBED_TEST_MODE backward compatibility
         - mbedtools configure -p tools/cmake/tests/mbed_test_mode -t GCC_ARM -m K64F --mbed-os-path .
-        - cmake -S tools/cmake/tests/mbed_test_mode -B tools/cmake/tests/mbed_test_mode/cmake_build/K64F/develop/GCC_ARM/ -GNinja -DCMAKE_BUILD_TYPE=develop
+        - cmake -S tools/cmake/tests/mbed_test_mode/ -B tools/cmake/tests/mbed_test_mode/cmake_build/K64F/develop/GCC_ARM/ -GNinja -DCMAKE_BUILD_TYPE=develop
         - cmake --build tools/cmake/tests/mbed_test_mode/cmake_build/K64F/develop/GCC_ARM/