Fix missing headers, generate compile db with bear

kernel/.gitignore

@@ -0,0 +1 @@
+*.json

kernel/libk/string.h

@@ -1,6 +1,8 @@
 #ifndef _KERNEL_LIBK_STRING_H
 #define _KERNEL_LIBK_STRING_H
 
+#include <libk/std.h>
+
 size_t memset (void* dst, uint8_t b, size_t n);
 size_t memcpy (void* dst, const void* src, size_t n);
 void strncpy (char* dst, const char* src, size_t n);

kernel/sys/proc.h

@@ -1,6 +1,8 @@
 #ifndef _KERNEL_SYS_PROC_H
 #define _KERNEL_SYS_PROC_H
 
+#include <libk/std.h>
+
 struct proc;
 
 struct proc* proc_from_elf (uint8_t* elf_contents);

make/kernel.mk

@@ -1,6 +1,9 @@
 all_kernel:
 	make -C kernel platform=$(platform) all
 
+all_compiledb_kernel:
+	bear --output kernel/compile_commands.json -- make -C kernel platform=$(platform) all
+
 clean_kernel:
 	make -C kernel platform=$(platform) clean