add musl to bulk builds

mk/build.mk

@@ -590,7 +590,7 @@ bulk:
 	done
 
 bulkall:
-	for libc in uclibc eglibc glibc;do \
+	for libc in uclibc eglibc glibc musl;do \
 	  while read arch; do \
 	      systems=$$(./scripts/getsystems $$arch| grep -v toolchain|grep -v qemu); \
 	      for system in $$systems;do \
@@ -608,7 +608,7 @@ bulkall:
 	done
 
 bulkallmod:
-	for libc in uclibc eglibc glibc;do \
+	for libc in uclibc eglibc glibc musl;do \
 	  while read arch; do \
 	      systems=$$(./scripts/getsystems $$arch| grep -v toolchain|grep -v qemu); \
 	      for system in $$systems;do \