linux-lg-us996: remove cross-compiler from makedepends (MR 2272)

and disable CONFIG_COMPAT_VDSO, otherwise build fails without armv7 compiler

device/testing/linux-lg-us996/APKBUILD

@@ -3,7 +3,7 @@
 
 pkgname=linux-lg-us996
 pkgver=3.18.113
-pkgrel=0
+pkgrel=1
 pkgdesc="LG V20 (us996) kernel fork"
 arch="aarch64"
 _carch="arm64"
@@ -18,7 +18,6 @@ makedepends="
 	bash
 	flex
 	gcc6
-	gcc-armv7
 	gmp-dev
 	bc
 	linux-headers
@@ -64,7 +63,7 @@ package() {
 
 sha512sums="
 bc15ff2fc2f452fc3e30704c36800e029a1911d5852b113b47f48264fcf43266ad1185cc69a5e8978bb9c091b94ef36f40a607545199546e0a554269de3ae71a  linux-lg-us996-c0cf2a6e4ccceb664492ca47b8b1c9f9d4a680c2.tar.gz
-762375e506ce2ef47912d874afee327781d494b4c80308633a0055f72372678c05b4ad8f999bc925c772755c41092046d49f3dd780ad656ee58029f9de4096c2  config-lg-us996.aarch64
+9ef29a250902e6f896788e1d443a86848f7bc762d21a72c89cc306a02844dfc1b709296cc12b3391339fcfed2b762ae14950d0686150d7507c28f3ef1fd723cc  config-lg-us996.aarch64
 2b48f1bf0e3f70703d2cdafc47d5e615cc7c56c70bec56b2e3297d3fa4a7a1321d649a8679614553dde8fe52ff1051dae38d5990e3744c9ca986d92187dcdbeb  gcc10-extern_YYLOC_global_declaration.patch
 531e8d26eb5a152e051d582f8e626b62299193b5099f953135ed944239a9eadab0d0cfb3c4566d3e86706d61a59dcf3b04d7760621b926e619d13944d5af387f  fix_include_paths.patch
 19a6c3445bfd8057e4fabe1709f3d2344f3a99fef49b44636c07a18ba8791fab1bcff77f93aadff887946ae6f83c9d86e1c28f9b88d03c6ba156704d430b4470  vdsomunge_upstream.patch

device/testing/linux-lg-us996/config-lg-us996.aarch64

@@ -505,7 +505,7 @@ CONFIG_COREDUMP=y
 CONFIG_COMPAT=y
 CONFIG_KUSER_HELPERS=y
 CONFIG_SYSVIPC_COMPAT=y
-CONFIG_COMPAT_VDSO=y
+# CONFIG_COMPAT_VDSO is not set
 CONFIG_CROSS_COMPILE_ARM32="armv7-alpine-linux-musleabihf-"
 
 #