package/efivar: needs threads

Add a thread dependency as Upstream quickly closed
https://github.com/rhboot/efivar/pull/238 to fix the following build
failure without threads raised since bump to version 38 in commit
f24029b561fbda0953c7dbd93d2485b03873996d and
https://github.com/rhboot/efivar/commit/cff88dd96b9d43e2c5875a24ba6180b196890ded:

thread-test.c:14:10: fatal error: pthread.h: No such file or directory
   14 | #include <pthread.h>
      |          ^~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/f2da14f91dc602a32dd5b2b7bdf3d3aa43afa7f4

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/efibootmgr/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_EFIBOOTMGR
 	bool "efibootmgr"
 	depends on BR2_PACKAGE_EFIVAR_ARCH_SUPPORTS # efivar
 	depends on !BR2_STATIC_LIBS # efivar
+	depends on BR2_TOOLCHAIN_HAS_THREADS # efivar
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12 # efivar
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # efivar
 	depends on !BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS
@@ -15,9 +16,9 @@ config BR2_PACKAGE_EFIBOOTMGR
 
 	  https://github.com/rhboot/efibootmgr
 
-comment "efibootmgr needs a toolchain w/ dynamic library, headers >= 3.12, gcc >= 4.9"
+comment "efibootmgr needs a toolchain w/ dynamic library, threads, headers >= 3.12, gcc >= 4.9"
 	depends on BR2_PACKAGE_EFIVAR_ARCH_SUPPORTS
-	depends on BR2_STATIC_LIBS || \
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS || \
 		!BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12 || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 	depends on !BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS

package/efivar/Config.in

@@ -9,6 +9,7 @@ config BR2_PACKAGE_EFIVAR
 	depends on BR2_PACKAGE_EFIVAR_ARCH_SUPPORTS
 	depends on !BR2_STATIC_LIBS # dlfcn.h
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12 # linux/nvme.h
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	# linux/nvme.h has been renamed to linux/nvme_ioctl.h since 4.4,
 	# and the efivar source handles that situation. However, some
 	# Sourcery CodeBench toolchains use 4.4 kernel headers but they
@@ -22,9 +23,9 @@ config BR2_PACKAGE_EFIVAR
 
 	  https://github.com/rhboot/efivar
 
-comment "efivar needs a toolchain w/ dynamic library, headers >= 3.12, gcc >= 4.9"
+comment "efivar needs a toolchain w/ dynamic library, threads, headers >= 3.12, gcc >= 4.9"
 	depends on BR2_PACKAGE_EFIVAR_ARCH_SUPPORTS
-	depends on BR2_STATIC_LIBS || \
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS || \
 		!BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12 || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 	depends on !BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS