Add platform detection to posix compilation script

compile

@@ -35,6 +35,9 @@ done
 CC=clang
 CFLAGS="-Wall -Wextra -Werror -pedantic"
 LIBFLAGS="-fPIC -shared"
+KERNEL="$(uname -s)"
+MACHINE="$(uname -m)"
+PLATFORM="${KERNEL}_${MACHINE}"
 
 if [[ $CC == "gcc" ]]; then
   # Used to disable the "ASan runtime does not come first in initial library list" error when compiling with gcc
@@ -66,7 +69,7 @@ esac
 TEST_INCLUDE="$(find tests -type d | xargs -I{} echo -n "-I{} ")"
 TEST_SRC="$(find tests -type f -name "*.c" | xargs -I{} echo -n "{} ")"
 
-BUILD_DIR="libwapp-build/posix-$BUILD_TYPE"
+BUILD_DIR="libwapp-build/$PLATFORM-$BUILD_TYPE"
 if [[ -d $BUILD_DIR ]]; then
   rm -rf $BUILD_DIR
 fi