tools: convert makefiles to kbuild style
Before this commit, makefiles under tools/ directory
were implemented with their own way.
This commit refactors them by using "hostprogs-y" variable.
Several C sources have been added to wrap other C sources
to simplify Makefile.
For example, tools/crc32.c includes lib/crc32.c
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/tools/env/linux_string.c b/tools/env/linux_string.c
new file mode 100644
index 0000000..6c01add
--- /dev/null
+++ b/tools/env/linux_string.c
@@ -0,0 +1 @@
+#include "../../lib/linux_string.c"