core/linux-grsec: fix the -dev package to work as intended

We copy the needed stuff from kernel source thats enough to fool
third party modules that we have the full source even if we dont.

This was taken from ubuntu build scripts.

core/linux-grsec/APKBUILD

@@ -4,7 +4,7 @@ _flavor=grsec
 pkgname=linux-${_flavor}
 pkgver=2.6.29.5
 _kernver=2.6.29
-pkgrel=0
+pkgrel=1
 pkgdesc="Linux kernel with grsecurity"
 url=http://grsecurity.net
 makedepends="perl installkernel"
@@ -58,7 +58,8 @@ build() {
 		INSTALL_PATH="$pkgdir"/boot
 
 	# point the build symlink to headers dir
-	rm -f "$pkgdir"/lib/modules/${_abi_release}/build
+	rm -f "$pkgdir"/lib/modules/${_abi_release}/build \
+		"$pkgdir"/lib/modules/${_abi_release}/source
 	ln -sf /usr/src/linux-headers-${_abi_release} \
 		"$pkgdir"/lib/modules/${_abi_release}/build
 }
@@ -69,7 +70,23 @@ dev()  {
 	mkdir -p "$dir"
 	cp "$srcdir"/kernelconfig "$dir"/.config
 	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" HOSTCC="$CC" \
-	                silentoldconfig prepare scripts
+		silentoldconfig prepare scripts
+
+	rm "$dir"/Makefile "$dir"/source
+
+	# copy the only the parts that we really need
+	# this is taken from ubuntu kernel build script
+	cd "$srcdir"/linux-$_kernver
+	find . -path './include/*' -prune -o -path './scripts/*' -prune \
+		-o -type f \( -name 'Makefile*' -o -name 'Kconfig*' \
+		-o -name 'Kbuild*' -o -name '*.sh' -o -name '*.pl' \
+		-o -name '*.lds' \) | cpio -pdm "$dir"
+	cp -a drivers/media/dvb/dvb-core/*.h "$dir"/drivers/media/dvb/dvb-core
+	cp -a drivers/media/video/*.h "$dir"/drivers/media/video
+	cp -a drivers/media/dvb/frontends/*.h "$dir"/drivers/media/dvb/frontends
+	cp -a scripts include "$dir"
+	find $(find arch -name include -type d -print) -type f \
+		| cpio -pdm "$dir"
 
 	install -Dm644 "$srcdir"/build/Module.symvers \
 		"$dir"/Module.symvers