Updated galera to 25.3.25 to be in line with MariaDB 10.3.13

Makefile

 all:
-	tar xf galera-3-25.3.23.tar.gz
-	patch -Np1 -d galera-3-25.3.23 < galera-3-25.3.23-gcc8.patch
-	cd galera-3-25.3.23 && HOME=/root ./scripts/build.sh
-	cp galera-3-25.3.23/libgalera_smm.so /usr/lib
-	rm -rf galera-3-25.3.23
+	tar xf galera-25.3.25.tar.gz
+	patch -Np1 -d galera-25.3.25 < galera-25.3.25-gcc8.patch
+	cd galera-25.3.25 && HOME=/root ./scripts/build.sh
+	cp galera-25.3.25/libgalera_smm.so /usr/lib
+	rm -rf galera-25.3.25

galera-3-25.3.23-gcc8.patch

-diff -uNr galera-3-25.3.23/gcache/configure.ac galera-3-25.3.23-relaxed/gcache/configure.ac
---- galera-3-25.3.23/gcache/configure.ac	2018-02-06 21:17:00.000000000 +1030
-+++ galera-3-25.3.23-relaxed/gcache/configure.ac	2018-08-31 23:32:24.680305850 +0930
-@@ -80,7 +80,7 @@
- AC_CONFIG_FILES([Makefile
-                  src/Makefile])
- 
--AM_CFLAGS="$AM_CFLAGS -Wall -Werror -Wextra -pedantic -Wno-unused-parameter"
-+AM_CFLAGS="$AM_CFLAGS -Wall -Wextra -pedantic -Wno-unused-parameter"
- AM_CXXFLAGS="$AM_CFLAGS -ansi -Weffc++ -Wold-style-cast -Wconversion"
- AM_CXXFLAGS="$AM_CXXFLAGS -fno-rtti -Wno-long-long"
- AM_CFLAGS="$AM_CFLAGS -std=c99"
-diff -uNr galera-3-25.3.23/SConstruct galera-3-25.3.23-relaxed/SConstruct
---- galera-3-25.3.23/SConstruct	2018-02-06 21:17:00.000000000 +1030
-+++ galera-3-25.3.23-relaxed/SConstruct	2018-08-31 23:32:05.301250294 +0930
-@@ -334,7 +334,7 @@
- """
-     context.Message('Checking whether to enable -Weffc++ ... ')
-     cxxflags_orig = context.env['CXXFLAGS']
--    context.env.Prepend(CXXFLAGS = '-Weffc++ -Werror ')
-+    context.env.Prepend(CXXFLAGS = '-Weffc++ ')
-     result = context.TryLink(test_source, '.cpp')
-     context.env.Replace(CXXFLAGS = cxxflags_orig)
-     context.Result(result)
-@@ -547,7 +547,7 @@
- 
- # these will be used only with our software
- if strict_build_flags == 1:
--    conf.env.Append(CCFLAGS = ' -Werror -pedantic')
-+    conf.env.Append(CCFLAGS = ' -pedantic')
-     if 'clang' in cxx_version:
-         conf.env.Append(CCFLAGS  = ' -Wno-self-assign')
-         conf.env.Append(CCFLAGS  = ' -Wno-gnu-zero-variadic-macro-arguments')