build: add support for disabling native command support

bshell.runtime/runtime/cmdcall.c

@@ -7,7 +7,6 @@
 #include <bshell/status.h>
 #include <fx/collections/array.h>
 #include <fx/collections/hashtable.h>
-#include <fx/diagnostics/process.h>
 #include <fx/io/path.h>
 #include <fx/reflection/assembly.h>
 #include <fx/reflection/function.h>
@@ -15,6 +14,10 @@
 #include <fx/string.h>
 #include <fx/vector.h>
 
+#if BSHELL_ENABLE_NATIVE_COMMANDS == 1
+#include <fx/diagnostics/process.h>
+#endif
+
 #if BSHELL_INTERACTIVE == 1
 #include <fx/term/print.h>
 #endif
@@ -107,6 +110,7 @@ static bshell_command *resolve_cmdlet(
 
 static const fx_string *get_path(void)
 {
+#if BSHELL_ENABLE_NATIVE_COMMANDS == 1
 	fx_process *self = fx_process_get_self();
 	if (!self) {
 		return NULL;
@@ -125,8 +129,12 @@ static const fx_string *get_path(void)
 	const fx_string *path = NULL;
 	fx_value_get_object(path_v, (fx_object **)&path);
 	return path;
+#else
+	return NULL;
+#endif
 }
 
+#if BSHELL_ENABLE_NATIVE_COMMANDS == 1
 static bshell_command *resolve_native_command_local(
 	struct bshell_cmdcall_p *cmdcall,
 	struct bshell_runtime *rt,
@@ -188,6 +196,7 @@ static bshell_command *resolve_native_command(
 	fx_iterator_unref(it);
 	return result;
 }
+#endif
 
 static enum bshell_status resolve_call_target(
 	struct bshell_cmdcall_p *cmdcall,
@@ -206,11 +215,13 @@ static enum bshell_status resolve_call_target(
 		return BSHELL_SUCCESS;
 	}
 
+#if BSHELL_ENABLE_NATIVE_COMMANDS == 1
 	if ((cmdcall->cmd_target
 	     = resolve_native_command(cmdcall, rt, cmd_name_s))) {
 		cmdcall->cmd_type = CMDCALL_NATIVE;
 		return BSHELL_SUCCESS;
 	}
+#endif
 
 	const char *cmd_name_cstr = fx_string_get_cstr(cmd_name_s);
 #if BSHELL_INTERACTIVE == 1