buildsys: eventually remove sys/eventfd.h

rm sys/eventfd.h unless linux_specific was chosen

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Makefile.in

@@ -270,7 +270,7 @@ HEADERS_RM-$(UCLIBC_HAS_WCHAR)               += wchar.h wctype.h
 HEADERS_RM-$(UCLIBC_HAS_WORDEXP)             += wordexp.h
 HEADERS_RM-$(UCLIBC_HAS_XATTR)               += sys/xattr.h
 HEADERS_RM-$(UCLIBC_HAS_XLOCALE)             += xlocale.h
-HEADERS_RM-$(UCLIBC_LINUX_SPECIFIC)          += sys/fsuid.h \
+HEADERS_RM-$(UCLIBC_LINUX_SPECIFIC)          += sys/eventfd.h sys/fsuid.h \
 	sys/inotify.h \
 	sys/kdaemon.h \
 	sys/perm.h \