extras/tools: bump m4 to 1.4.19

extras/tools/SHA512SUMS

@@ -3,7 +3,7 @@
 f09440681e0c414f5ca669f3aeba6666d09e0642f30a2e12c3199e7fb3da95a7dd17994fc54475c49638c37f0502ea0a2d8da0f9098805f11088ba7b299bf72a  cmake-3.17.0.tar.gz
 9953413376c6b33e9e49d1f4f5b2d50075e0b1defb17b3c233d186d21416e6b607df11f6030588eeec3b025e1075c9c37a3db3c872fc22329d1dc0d0c6e2d9d0  gas-preprocessor-72887b9.tar.gz
 2bc5331f9807da8754b2ee623a30299cc0d103d6f98068a4c22263aab67ff148b7ad3a1646bd274e604bc08a8ef0ac2601e6422e641ad0cfab2222d60a58c5a8  autoconf-2.71.tar.gz
-29254dd4267a093e8d9da3a26df8b02564044cdb4506be539ec1aff4e5d406477bcf32f5e813c840f3aec77293bfe2cdde18f6a21724a7e0bfff646ec88b74ae  m4-1.4.18.tar.gz
+f5dd0f02fcae65a176a16af9a8e1747c26e9440c6c224003ba458d3298b777a75ffb189aee9051fb0c4840b2a48278be4a51d959381af0b1d627570f478c58f2  m4-1.4.19.tar.gz
 56a9656539448972bc3080357ccc987bd4cbca3847758fe41251eb8af1a5e403a75f38d1344fa2c0bd56de880f37f3eaafbe7116c506f33331e7a8dd8a53cf2a  pkg-config-0.28-1.tar.gz
 9f85a98e55cbc9f245a3079d5a597f778454bc945f0942cb10fbdfbde5fe12b17d6dda93d6a8d5281459ad30a3840be7e0712feb33a824226884e7e4da54a061  protobuf-3.1.0.tar.gz
 6c1fe4f6fa8546ae28b92ccfbae94355ff0d3cea346b9ae8ce4cf6c2bdbeb823e0ccd355332643ea72d3befd533a8b3030ddbf82be7ffa811c2c58cbb01aaa38  ragel-6.10.tar.gz

extras/tools/packages.mak

@@ -21,7 +21,7 @@ AUTOCONF_URL=$(GNU)/autoconf/autoconf-$(AUTOCONF_VERSION).tar.gz
 AUTOMAKE_VERSION=1.16.5
 AUTOMAKE_URL=$(GNU)/automake/automake-$(AUTOMAKE_VERSION).tar.gz
 
-M4_VERSION=1.4.18
+M4_VERSION=1.4.19
 M4_URL=$(GNU)/m4/m4-$(M4_VERSION).tar.gz
 
 PKGCFG_VERSION=0.28-1