Try to build just llvm in travis right now

Currently all our build in Travis CI time out so let's try to regenerate
the cache because it seems like it is corrupted since we upgraded to
Xenail.

.travis.yml

@@ -57,23 +57,23 @@ script:
   # We use "-O0" to speed up the build.
   # "-O0" causes segfaults in LLVM if we do not use "-DNDEBUG" as well.
   - cmake -DCMAKE_CXX_FLAGS_RELEASE="-O0 -DNDEBUG" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$(pwd)/install" -DRETDEC_TESTS=ON -DRETDEC_DEV_TOOLS=ON -DRETDEC_COMPILE_YARA=OFF ..
-  - time make install -j $NPROC
+  - time make llvm-project -j $NPROC
   # Check that install is movable and that it does not need the build directory.
-  - mv install ../retdec-install
-  - cd ..
-  - rm -rf build
-  # Run unit tests.
-  - python3 retdec-install/bin/retdec-tests-runner.py
-  # Run the decompilation script.
-  - python3 retdec-install/bin/retdec-decompiler.py --help
-  # Run a simple decompilation.
-  - echo -e '#include <stdio.h>\n#include <stdlib.h>\nint main()\n{\n  printf("hello world\\n");\n  return 0;\n}\n' > hello-orig.c
-  - cat hello-orig.c
-  - gcc -m32 -o hello hello-orig.c
-  - ./hello
-  - python3 retdec-install/bin/retdec-decompiler.py hello
-  - cat hello.c
-  - grep "int main(int argc, char \*\* argv)" hello.c
+  #- mv install ../retdec-install
+  #- cd ..
+  #- rm -rf build
+  ## Run unit tests.
+  #- python3 retdec-install/bin/retdec-tests-runner.py
+  ## Run the decompilation script.
+  #- python3 retdec-install/bin/retdec-decompiler.py --help
+  ## Run a simple decompilation.
+  #- echo -e '#include <stdio.h>\n#include <stdlib.h>\nint main()\n{\n  printf("hello world\\n");\n  return 0;\n}\n' > hello-orig.c
+  #- cat hello-orig.c
+  #- gcc -m32 -o hello hello-orig.c
+  #- ./hello
+  #- python3 retdec-install/bin/retdec-decompiler.py hello
+  #- cat hello.c
+  #- grep "int main(int argc, char \*\* argv)" hello.c
 
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