extra/kdiff3 to 1.9.0-2

extra/kdiff3/PKGBUILD

@@ -6,7 +6,7 @@
 
 pkgname=kdiff3
 pkgver=1.9.0
-pkgrel=1
+pkgrel=2
 pkgdesc='A file comparator/merge tool'
 arch=(x86_64)
 url='https://kde.org/applications/development/kdiff3/'
@@ -28,7 +28,8 @@ prepare() {
 }
 
 build() {
-  cmake -B build -S $pkgname-$pkgver
+  cmake -B build -S $pkgname-$pkgver \
+    -DCMAKE_CXX_FLAGS="${CXXFLAGS} -DNDEBUG"
   cmake --build build
 }