libdispatch: fix build on CRUX musl

libdispatch/.signature

@@ -1,5 +1,5 @@
 untrusted comment: verify with /etc/ports/jmq.pub
-RWTTPlFarK9CxB8o2MO5+jZrq6U61ClvC1W/4EU9H3s3A5w2lS4BLzxmsjYeHoPH9jdaHlKOZXkRvui6vxdML0B0G/GpshI7RAk=
-SHA256 (Pkgfile) = c9692ea9d861977fc47855bde2ec69ded97b7fa2ad804952a6e9cf2b49171cc6
+RWTTPlFarK9CxMazw2Wg+GAU5BYEbEFlxUs3AvDmMMsZSWrVaHLT9nAvOo8tmDyn8g0ODhtqbKp5+DJArge1P54yD4gpBHQOfgE=
+SHA256 (Pkgfile) = 38f030362ed16964db7ca663dc710e09ac5badee71c804848eaf19debdcc41d0
 SHA256 (.footprint) = 434fdf7c780c53773601779638fdd9582f322134ab7a7a039381c6a8c6e12583
 SHA256 (swift-5.10-RELEASE.zip) = c70831a43bb712e4abffc1868c59e47b4a0937e8b70e16739bc398be27dcb76c

libdispatch/Pkgfile

@@ -11,16 +11,20 @@ source=(https://github.com/apple/swift-corelibs-$name/archive/refs/tags/swift-$v
 build() {
     find swift-corelibs-* -name DispatchCompilerWarnings.cmake \
          -exec sed -i "/-Werror/d" '{}' \;
-    mkdir build && cd build
+    sed -e "s/HAVE_DECL_PROGRAM.*/defined(_GNU_SOURCE)/" \
+        -i swift-corelibs-${name}-*/src/shims/getprogname.h
     
-    cmake -G Ninja -DCMAKE_C_COMPILER=clang      \
+    cmake -S swift-corelibs-$name-* -B build                \
+        -DCMAKE_C_COMPILER=clang                            \
         -DCMAKE_CXX_COMPILER=clang++                        \
         -DCMAKE_BUILD_TYPE=Release                          \
+	-DCMAKE_C_FLAGS_RELEASE="$CFLAGS -D_GNU_SOURCE"     \
+	-DCMAKE_CXX_FLAGS_RELEASE="$CXXFLAGS -D_GNU_SOURCE" \
         -DCMAKE_INSTALL_PREFIX=/usr                         \
         -DCMAKE_INSTALL_LIBDIR=lib                          \
         -DBlocksRuntime_INCLUDE_DIR=/usr/include            \
         -DCMAKE_BUILD_WITH_INSTALL_RPATH=on                 \
-        ../swift-corelibs-$name-*
-    ninja -j ${JOBS:-1}
-    DESTDIR=$PKG ninja install
+	-G Ninja
+    ninja -C build -j ${JOBS:-1}
+    DESTDIR=$PKG ninja -C build install
 }