util-lib: move nss-util.h from shared/ to basic/

The header file defines some helpers for GLIBC NSS and doesn't include
anything else but glibc headers, hence there's little reason to keep it
in shared/.

See: #2008

Makefile.am

@@ -947,7 +947,8 @@ libbasic_la_SOURCES = \
 	src/basic/copy.h \
 	src/basic/alloc-util.h \
 	src/basic/alloc-util.c \
-	src/basic/formats-util.h
+	src/basic/formats-util.h \
+	src/basic/nss-util.h
 
 nodist_libbasic_la_SOURCES = \
 	src/basic/errno-from-name.h \
@@ -1007,7 +1008,6 @@ libshared_la_SOURCES = \
 	src/shared/base-filesystem.h \
 	src/shared/uid-range.c \
 	src/shared/uid-range.h \
-	src/shared/nss-util.h \
 	src/shared/install.c \
 	src/shared/install.h \
 	src/shared/install-printf.c \

src/basic/nss-util.h

@@ -27,7 +27,6 @@
 #include <pwd.h>
 #include <resolv.h>
 
-
 #define NSS_GETHOSTBYNAME_PROTOTYPES(module)            \
 enum nss_status _nss_##module##_gethostbyname4_r(       \
                 const char *name,                       \