package/intel-gmmlib: needs C++

intel-gmmlib needs C++ since its addition in commit
93e4ee81a2e3e163bf74c24b6ec68f9446f96ae4 and
https://github.com/intel/gmmlib/commit/7a1ec78c0bc74939ba3ef61854f98eb4d7267cc3:

CMake Error at /nvmedata/autobuild/instance-15/output-1/host/share/cmake-3.18/Modules/CMakeTestCXXCompiler.cmake:59 (message):
  The C++ compiler

    "/usr/bin/clang++"

  is not able to compile a simple test program.

Fixes:
 - http://autobuild.buildroot.org/results/8cadfee0288a05676868e05d56243d866cbf051d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/intel-gmmlib/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_INTEL_GMMLIB
 	bool "intel-gmmlib"
 	depends on BR2_x86_64
 	depends on !BR2_STATIC_LIBS
+	depends on BR2_INSTALL_LIBSTDCPP
 	help
 	  The Intel(R) Graphics Memory Management Library provides
 	  device specific and buffer management for the Intel(R)
@@ -10,5 +11,5 @@ config BR2_PACKAGE_INTEL_GMMLIB
 
 	  https://github.com/intel/gmmlib
 
-comment "intel-gmmlib needs a toolchain w/ dynamic library"
-	depends on BR2_STATIC_LIBS
+comment "intel-gmmlib needs a toolchain w/ dynamic library, C++"
+	depends on BR2_STATIC_LIBS || !BR2_INSTALL_LIBSTDCPP

package/intel-mediadriver/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_INTEL_MEDIADRIVER
 	bool "intel-mediadriver"
 	depends on BR2_x86_64
 	depends on !BR2_STATIC_LIBS # mesa3d, libva
-	depends on BR2_INSTALL_LIBSTDCPP # mesa3d
+	depends on BR2_INSTALL_LIBSTDCPP # intel-gmmlib, mesa3d
 	depends on BR2_TOOLCHAIN_HAS_SYNC_1 # mesa3d
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libva
 	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL # mesa3d