bootstrap: Don't check gettext version

NetBSD gettext is older than the check but we don't actually need 0.18.3,
older one works fine. This is needed to make bootstrap work on NetBSD.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

INSTALL

@@ -20,7 +20,7 @@ configuring the GRUB.
   for i386, x86_64, arm (including thumb), arm64, mips(el), powerpc, sparc64
 * GNU Make
 * GNU Bison 2.3 or later
-* GNU gettext 0.17 or later
+* GNU gettext
 * GNU binutils 2.9.1.0.23 or later
 * Flex 2.5.35 or later
 * pkg-config

bootstrap.conf

@@ -68,7 +68,7 @@ SKIP_PO=t
 buildreq="\
 autoconf   2.64
 automake   1.14
-gettext    0.18.3
+gettext    -
 git        1.5.5
 patch      -
 tar        -