build-libcxx: Stop manually linking to -lpsapi

Since the default _WIN32_WINNT now is for Windows 7, psapi.h
redirects to PSAPI version 2, which is available in kernel32.dll
with a "K32" prefix on the function names (K32EnumProcessModules).

build-libcxx.sh

@@ -90,19 +90,12 @@ build_all() {
             -DLIBUNWIND_ENABLE_CROSS_UNWINDING=FALSE \
             -DCMAKE_CXX_FLAGS="-Wno-dll-attribute-on-redeclaration" \
             -DCMAKE_C_FLAGS="-Wno-dll-attribute-on-redeclaration" \
-            -DCMAKE_SHARED_LINKER_FLAGS="-lpsapi" \
             ..
         make -j$CORES
         make install
         if [ "$type" = "shared" ]; then
             mkdir -p $PREFIX/$arch-w64-mingw32/bin
             cp lib/libunwind.dll $PREFIX/$arch-w64-mingw32/bin
-        else
-            # Merge libpsapi.a into the static library libunwind.a, to
-            # avoid having to specify -lpsapi when linking to it.
-            llvm-ar qcsL \
-                $PREFIX/$arch-w64-mingw32/lib/libunwind.a \
-                $PREFIX/$arch-w64-mingw32/lib/libpsapi.a
         fi
         cd ..
     done