backport timer fix for >=4.15 kernels

PKGBUILD

@@ -2,7 +2,7 @@
 # Contributor:dront78 <dront78@gmail.com>
 pkgname=systemtap
 pkgver=3.2
-pkgrel=3
+pkgrel=4
 pkgdesc="provides infrastructure to simplify the gathering of information about the running system."
 url="http://sourceware.org/systemtap/"
 arch=('x86_64' 'i686')
@@ -13,11 +13,15 @@ optdepends=('sqlite3: for storing results in a database')
 source=("${pkgname}-${pkgver}.tar.gz::https://sourceware.org/systemtap/ftp/releases/${pkgname}-${pkgver}.tar.gz"
         "${pkgname}-${pkgver}.tar.gz.asc::https://sourceware.org/systemtap/ftp/releases/${pkgname}-${pkgver}.tar.gz.asc"
         'stp_remove_install_hooks.patch'
-        'fixes-for-gcc-8.patch')
+        'fixes-for-gcc-8.patch'
+        'fix-timers-for-4.15-kernel.patch'
+        )
 sha512sums=('6036ed1b5189fd3fcfdeeaa526a3539ac632d0b687a063b5e3424e8f613bfc2c8d079742b0262b547128e97e30e4beb61898b23761657aee519e61346ac92e94'
             'SKIP'
             '1d2758e9f875e06d08d37679587454fb43e025aa83ceeb405b1bc8d3277476502f2d67cf9e8383cc4c63ae545d7d0e9ebaab814f880b2f53bba47bef4afcd537'
-            '970d83ace43909e5a1bfc4112d78dd913af6d59e4b8dc8c4461370b022092b0cdb6830427b52bcf5b7409ff6d7c79dab778e53398ba65de71bd4a270c66a2d3a')
+            '970d83ace43909e5a1bfc4112d78dd913af6d59e4b8dc8c4461370b022092b0cdb6830427b52bcf5b7409ff6d7c79dab778e53398ba65de71bd4a270c66a2d3a'
+            '3cbf261cf34df23454e0a9aa4566664241b8bcf4b44a28617cce483d0f24632b9fcd4ac8b37f488e736d0ce02308fb67e7b4dd52f6349a9010e2390d8c94190d'
+            )
 install='systemtap.install'
 validpgpkeys=('5D38116FA4D3A7CC77E378D37E83610126DCC2E8')
 
@@ -25,6 +29,7 @@ prepare() {
   cd "${pkgname}-${pkgver}"
   patch -Np1 -i "${srcdir}/stp_remove_install_hooks.patch"
   patch -Np1 -i "${srcdir}/fixes-for-gcc-8.patch"
+  patch -Np1 -i "${srcdir}/fix-timers-for-4.15-kernel.patch"
   autoreconf -i
 }
 build() {