qalculate-qt: add pthread library to linker flags

mingw-w64-qalculate-qt/0001-qmake-add-pthread.patch

@@ -0,0 +1,11 @@
+--- a/qalculate-qt.pro
++++ b/qalculate-qt.pro
+@@ -27,7 +27,7 @@
+ TARGET = qalculate-qt
+ INCLUDEPATH += src
+ win32: {
+-	LIBS += -lqalculate -lxml2 -lmpfr -liconv -lintl -lgmp -licuuc -lcurl
++	LIBS += -lqalculate -lxml2 -lmpfr -liconv -lintl -lgmp -licuuc -lcurl -lpthread
+ 	CONFIG += c++17
+ } else {
+ 	CONFIG += link_pkgconfig

mingw-w64-qalculate-qt/PKGBUILD

@@ -13,6 +13,7 @@ msys2_repository_url='https://github.com/Qalculate/qalculate-qt'
 license=('spdx:GPL-2.0-or-later')
 depends=(
   "${MINGW_PACKAGE_PREFIX}-libqalculate"
+  "${MINGW_PACKAGE_PREFIX}-libwinpthread"
   "${MINGW_PACKAGE_PREFIX}-qt6-base"
   "${MINGW_PACKAGE_PREFIX}-qt6-svg"
 )
@@ -20,9 +21,17 @@ makedepends=(
   "${MINGW_PACKAGE_PREFIX}-cc"
   "${MINGW_PACKAGE_PREFIX}-pkgconf"
   "${MINGW_PACKAGE_PREFIX}-qt6-tools"
+  "${MINGW_PACKAGE_PREFIX}-winpthreads"
 )
-source=("https://github.com/Qalculate/qalculate-qt/releases/download/v${pkgver}/${_realname}-${pkgver}.tar.gz")
-sha256sums=('7c8e3074b709177462ead9b2b36736b18f1cb0f8e88dda3608911b9f7491c8e6')
+source=("https://github.com/Qalculate/qalculate-qt/releases/download/v${pkgver}/${_realname}-${pkgver}.tar.gz"
+        0001-qmake-add-pthread.patch)
+sha256sums=('7c8e3074b709177462ead9b2b36736b18f1cb0f8e88dda3608911b9f7491c8e6'
+            '1e2994244bee6e3b4e58a3e4d7e2cb23629cec3b8fc5ca9ff958860e89626c5e')
+
+prepare() {
+  cd "${_realname}-${pkgver}"
+  patch -p1 -i "${srcdir}"/0001-qmake-add-pthread.patch
+}
 
 build() {
   cd "${_realname}-${pkgver}"