toolchain-external: introduce BR2_TOOLCHAIN_EXTERNAL_OPENMP

Add a new option for custom external toolchains to enable OpenMP
support.

Signed-off-by: Ed Blake <ed.blake@sondrel.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

toolchain/toolchain-external/toolchain-external-custom/Config.in.options

@@ -425,6 +425,14 @@ config BR2_TOOLCHAIN_EXTERNAL_FORTRAN
 	  support. If you don't know, leave the default value,
 	  Buildroot will tell you if it's correct or not.
 
+config BR2_TOOLCHAIN_EXTERNAL_OPENMP
+	bool "Toolchain has OpenMP support?"
+	select BR2_TOOLCHAIN_HAS_OPENMP
+	help
+	  Select this option if your external toolchain has OpenMP
+	  support. If you don't know, leave the default value,
+	  Buildroot will tell you if it's correct or not.
+
 config BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS
 	string "Extra toolchain libraries to be copied to target"
 	help