Include more headers explicitly (#38169)

Similar to the recent change like
4f18ff2e29.

src/include/override/sys/generate-syscall.py

@@ -44,6 +44,10 @@ HEADER = '''\
 
 #include_next <sys/syscall.h>
 
+#ifdef ARCH_MIPS
+#include <asm/sgidefs.h>
+#endif
+
 #include <assert.h>
 '''
 

src/include/override/sys/syscall.h

@@ -8,6 +8,10 @@
 
 #include_next <sys/syscall.h>
 
+#ifdef ARCH_MIPS
+#include <asm/sgidefs.h>
+#endif
+
 #include <assert.h>
 
 /* Note: if this code looks strange, this is because it is derived from the same