pacman: make -j1 as there is a race condition otherwise

pacman/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=pacman
 _base_ver=4.1.2
-pkgver=4.1.2.5706.577ddb1
+pkgver=4.1.2.5729.fda2762
 pkgrel=1
 pkgdesc="A library-based package manager with dependency support (MSYS2 port)"
 arch=('i686' 'x86_64')
@@ -61,7 +61,7 @@ build() {
     --localstatedir=/var --enable-doc \
     --with-scriptlet-shell=/usr/bin/bash \
     --with-pkg-ext=.pkg.tar.xz
-  make
+  make -j1
   make -C contrib
 }