Update windows build commands

Supply correct line escape character.

00-build-cache-debug-x64.bat

@@ -1,10 +1,10 @@
-cmake \
-  -DCMAKE_SIZEOF_VOID_P=8 \
-  "-DCMAKE_MT=%CMAKE_MT%" \
-  -DCMAKE_BUILD_TYPE=Debug \
-  -DCMAKE_MAKE_PROGRAM=ninja \
-  -DCMAKE_C_COMPILER=clang-cl \
-  -DCMAKE_C_FLAGS=-m64 \
-  -G Ninja \
-  -S . \
+cmake^
+  -DCMAKE_SIZEOF_VOID_P=8^
+  "-DCMAKE_MT=%CMAKE_MT%"^
+  -DCMAKE_BUILD_TYPE=Debug^
+  -DCMAKE_MAKE_PROGRAM=ninja^
+  -DCMAKE_C_COMPILER=clang-cl^
+  -DCMAKE_C_FLAGS=-m64^
+  -G Ninja^
+  -S .^
   -B ./build/Debug

README.md

@@ -32,15 +32,15 @@ The following are required for building on all platforms:
 5. Generate the CMake cache.
 
    ```shell
-   cmake \
-     -DCMAKE_SIZEOF_VOID_P=8 \
-     "-DCMAKE_MT=%CMAKE_MT%" \
-     "-DCMAKE_BUILD_TYPE=%BUILD_TYPE%" \
-     -DCMAKE_MAKE_PROGRAM=ninja \
-     -DCMAKE_C_COMPILER=clang-cl \
-     -DCMAKE_C_FLAGS=-m64 \
-     -G Ninja \
-     -S . \
+   cmake^
+     -DCMAKE_SIZEOF_VOID_P=8^
+     "-DCMAKE_MT=%CMAKE_MT%"^
+     "-DCMAKE_BUILD_TYPE=%BUILD_TYPE%"^
+     -DCMAKE_MAKE_PROGRAM=ninja^
+     -DCMAKE_C_COMPILER=clang-cl^
+     -DCMAKE_C_FLAGS=-m64^
+     -G Ninja^
+     -S .^
      -B "./build/%BUILD_TYPE%"
    ```