Add missing dependencies for `autogen.sh`

- Update patch

The source tarball, unlike the release tarball, does not contain any
configure scripts. We need to generate these using `autogen.sh`, which
requires a few more dependencies.

Since we changed source, the patch needed revision, too.

libunibreak-4.0-offline_checks.patch

@@ -1,8 +1,10 @@
---- libunibreak-4.0/src/Makefile.in.offline_checks	2016-12-14 16:29:12.000000000 -0800
-+++ libunibreak-4.0/src/Makefile.in	2018-08-28 19:12:22.097289204 -0700
-@@ -848,20 +848,11 @@
- 	cat ${srcdir}/graphemebreakdata1.tmpl tmp.txt ${srcdir}/graphemebreakdata2.tmpl >> ${srcdir}/graphemebreakdata.c
- 	rm tmp.txt tmp.txt.bak
+diff --git a/src/Makefile.am b/src/Makefile.am
+index 7f4b585..d7a8ad1 100644
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -98,17 +98,8 @@ tests_CPPFLAGS = -I$(srcdir)
+ tests_LDADD = libunibreak.la
+ tests_DEPENDENCIES = libunibreak.la
  
 -check: LineBreakTest.txt WordBreakTest.txt GraphemeBreakTest.txt $(check_PROGRAMS)
 +check: $(check_PROGRAMS)
@@ -19,6 +21,3 @@
 -GraphemeBreakTest.txt:
 -	wget http://www.unicode.org/Public/UNIDATA/auxiliary/GraphemeBreakTest.txt
 -
- # Tell versions [3.59,3.63) of GNU make to not export all variables.
- # Otherwise a system limit (for SysV at least) may be exceeded.
- .NOEXPORT:

libunibreak.spec

@@ -27,6 +27,7 @@ Patch2:         %{name}-4.0-remove_unused_var.patch
 
 BuildRequires:  gcc
 BuildRequires:  make
+BuildRequires:  automake, autoconf, libtool
 
 Provides:       liblinebreak = %{version}-%{release}
 Obsoletes:      liblinebreak < %{obsEVR}
@@ -55,6 +56,7 @@ cp -p %{SOURCE1} %{SOURCE2} %{SOURCE3} src/
 
 
 %build
+./autogen.sh
 %configure --disable-static
 %make_build