package/android-tools: fastboot needs gcc >= 5

Commit 56d9b887685c86fd4fbadda247cdbe733d499e81 forgot to add gcc >= 5
dependency to fastboot:

Makefile:591: *** libsepol is in the dependency chain of libselinux that has added it to its _DEPENDENCIES variable without selecting it or depending on it from Config.in.  Stop.

Fixes:
 - http://autobuild.buildroot.org/results/2430ba4afb40569ed54506201494baeebf6c5d42

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/android-tools/Config.in

@@ -38,6 +38,7 @@ config BR2_PACKAGE_ANDROID_TOOLS_FASTBOOT
 	bool "fastboot"
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libselinux
 	depends on !BR2_STATIC_LIBS # libselinux
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # libselinux -> libsepol
 	depends on BR2_PACKAGE_ANDROID_TOOLS_FASTBOOT_GOOD_KERNEL_HEADERS
 	select BR2_PACKAGE_LIBSELINUX
 	select BR2_PACKAGE_ZLIB
@@ -46,8 +47,9 @@ config BR2_PACKAGE_ANDROID_TOOLS_FASTBOOT
 	  the target, which can be used to reflash other target devices
 	  implementing the fastboot protocol.
 
-comment "fastboot needs a toolchain w/ threads, dynamic library"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
+comment "fastboot needs a toolchain w/ threads, dynamic library, gcc >= 5"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_5
 
 comment "fastboot needs headers >= 3.10 (PowerPC64), headers >= 3.16 (MIPS64)"
 	depends on !BR2_arc