message: depends: More robust cmake invocation
  Specify well-known env vars instead of using a workaround to split up CC
  and CXX.
diff: @@ -157,12 +157,12 @@ ifneq ($($(1)_ldflags),)
  $(1)_autoconf += LDFLAGS="$$($(1)_ldflags)"
  endif
  -$(1)_cmake=cmake -DCMAKE_INSTALL_PREFIX=$($($(1)_type)_prefix)
  +$(1)_cmake=env CC="$$($(1)_cc)" CXX="$$($(1)_cxx)" CFLAGS="$$($(1)_cflags)" CXXFLAGS="$$($(1)_cxxflags)" cmake -DCMAKE_INSTALL_PREFIX:PATH=$($($(1)_type)_prefix)
  ifneq ($($(1)_type),build)
  ifneq ($(host),$(build))
  -$(1)_cmake += -DCMAKE_SYSTEM_NAME=$($(host_os)_cmake_system) -DCMAKE_SYSROOT=$(host_prefix)
  -$(1)_cmake += -DCMAKE_C_COMPILER_TARGET=$(host) -DCMAKE_C_COMPILER=$(firstword $($($(1)_type)_CC)) -DCMAKE_C_FLAGS="$(wordlist 2,1000,$($($(1)_type)_CC))"
  -$(1)_cmake += -DCMAKE_CXX_COMPILER_TARGET=$(host) -DCMAKE_CXX_COMPILER=$(firstword $($($(1)_type)_CXX)) -DCMAKE_CXX_FLAGS="$(wordlist 2,1000,$($($(1)_type)_CXX))"
  +$(1)_cmake += -DCMAKE_SYSTEM_NAME=$($(host_os)_cmake_system)
  +$(1)_cmake += -DCMAKE_C_COMPILER_TARGET=$(host)
  +$(1)_cmake += -DCMAKE_CXX_COMPILER_TARGET=$(host)
  endif
  endif
  endef
  