proxysql: stop using old CMake

component/cmake/buildout.cfg

@@ -14,8 +14,3 @@ md5sum = c0feb5855604f68b09bdb3acb623619e
 environment =
   CMAKE_INCLUDE_PATH=${ncurses:location}/include:${openssl:location}/include
   CMAKE_LIBRARY_PATH=${ncurses:location}/lib:${openssl:location}/lib
-
-[cmake-3.18]
-<= cmake
-url = https://cmake.org/files/v3.18/cmake-3.18.4.tar.gz
-md5sum = 0380beaee1c39a22455db02651abe7be

component/proxysql/buildout.cfg

@@ -36,7 +36,7 @@ post-install =
   install -Dt %(location)s/bin %(make-targets)s
 environment =
   PKG_CONFIG_PATH=${openssl:location}/lib/pkgconfig:${gnutls:location}/lib/pkgconfig:${libgcrypt:location}/lib/pkgconfig:${zlib:location}/lib/pkgconfig:${pcre:location}/lib/pkgconfig
-  PATH=${m4:location}/bin:${libtool:location}/bin:${libgcrypt:location}/bin:${curl:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${bzip2:location}/bin:${autoconf:location}/bin:${git:location}/bin:${automake:location}/bin:${patch:location}/bin:${cmake-3.18:location}/bin:%(PATH)s:${python2.7:location}/bin
+  PATH=${m4:location}/bin:${libtool:location}/bin:${libgcrypt:location}/bin:${curl:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${bzip2:location}/bin:${autoconf:location}/bin:${git:location}/bin:${automake:location}/bin:${patch:location}/bin:${cmake:location}/bin:%(PATH)s:${python2.7:location}/bin
   CXXFLAGS=-I${openssl:location}/include -I${gnutls:location}/include -I${zlib:location}/include
   CFLAGS=-I${gnutls:location}/include
   LDFLAGS=-L${openssl:location}/lib -Wl,-rpath -Wl,${gnutls:location}/lib -L${gnutls:location}/lib -Wl,-rpath=${curl:location}/lib -L${libtool:location}/lib -L${zlib:location}/lib -Wl,-rpath -Wl,${zlib:location}/lib -L${curl:location}/lib -L${pcre:location}/lib -L${jemalloc:location}/lib -L${libmicrohttpd:location}/lib
@@ -44,3 +44,7 @@ environment =
   CMAKE_LIBRARY_PATH=${openssl:location}/lib:${gnutls:location}/lib:${curl:location}/lib:${pcre:location}/lib:${jemalloc:location}/lib:${libmicrohttpd:location}/lib:${zlib:location}/lib
   LIBTOOL=libtool
   ACLOCAL_PATH=${pkgconfig:location}/share/aclocal:${libtool:location}/share/aclocal
+patch-options = -p1
+patches =
+# PR #3402 (mariadb_client: backport patch to fix syntax error in cmake 3.20)
+  https://github.com/sysown/proxysql/commit/a3cfa56d257219f7610cd5711045bb5d84485a91.patch