package/pkg-cmake.mk: force check_language(CXX) to be false when building w/o C+++
See the code snippet below, which typically is used to check if
C++ support can be enabled.
If we manually set CMAKE_CXX_COMPILER to /bin/false, then cmake
will assume that it's fine, without having a real check. Otherwise,
it will do a test run but somehow it falls back to /bin/c++, even
when cross-compiling. Fix that by setting CXX to /bin/false.
```cmake
include(CheckLanguage)
check_language(CXX)
if(CMAKE_CXX_COMPILER)
enable_language(CXX)
endif()
```
Signed-off-by: Thomas Devoogdt <thomas@devoogdt.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit b34e0d27ab8a9529cbc0df3ade7f9eedca50041f)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Thomas Devoogdt