kernel-headers: Fix sched_param redef

In file included from bionic/libc/include/pthread.h:41:
bionic/libc/include/sched.h:99:8: error: redefinition of 'sched_param'
   99 | struct sched_param {
      |        ^

kernel-headers/Makefile

@@ -4,6 +4,7 @@ PATCHLEVEL = 15
 headers_install:
 	@mkdir -p $(O)/usr/include
 	@rsync -mrq $(shell pwd)/* $(O)/usr/include
+	@find $(O)/usr/include -type f -name "*.h" -exec sed -i 's/struct sched_param/struct __kernel_sched_param/g' {} +
 
 all:
 	@true