psm says: use $(top_builddir) instead of $(top_srcdir) when accessing generated header files

extra/locale/Makefile.in

@@ -10,7 +10,9 @@ WGET := wget --passive-ftp
 
 LOCALE_DATA_FILENAME := uClibc-locale-030818.tgz
 
-BUILD_CFLAGS-locale-common := -D__UCLIBC_GEN_LOCALE -DUCLIBC_CTYPE_HEADER='"$(top_srcdir)/include/bits/uClibc_ctype.h"'
+BUILD_CFLAGS-locale-common := \
+	-D__UCLIBC_GEN_LOCALE \
+	-DUCLIBC_CTYPE_HEADER='"$(top_builddir)/include/bits/uClibc_ctype.h"'
 
 BUILD_CFLAGS-gen_wc8bit := $(BUILD_CFLAGS-locale-common) -DCTYPE_PACKED=1