chore(repo): remove obsolete windows build helper

demo/build.bat

@@ -1,84 +0,0 @@
-@echo off
-setlocal
-
-set ROOT_DIR=%~dp0..
-set OUT_DIR=%~dp0build
-set DEMO_EXE=%OUT_DIR%\ikv_demo.exe
-set TEST_EXE=%OUT_DIR%\ikv_tests.exe
-set COV_DIR=%ROOT_DIR%\coverage
-set COV_EXE=%COV_DIR%\ikv_tests_cov.exe
-
-if not exist "%OUT_DIR%" mkdir "%OUT_DIR%"
-
-gcc -std=c11 -Wall -Wextra -pedantic ^
-    -I"%ROOT_DIR%\include" ^
-    "%~dp0main.c" ^
-    "%ROOT_DIR%\src\ikv.c" ^
-    "%ROOT_DIR%\src\loaders\ikv1.c" ^
-    "%ROOT_DIR%\src\loaders\ikv2.c" ^
-    -o "%DEMO_EXE%"
-
-if errorlevel 1 (
-    echo demo build failed
-    exit /b 1
-)
-
-gcc -std=c11 -Wall -Wextra -pedantic ^
-    -DIKV_TESTING ^
-    -I"%ROOT_DIR%\include" ^
-    "%~dp0unit_test.c" ^
-    "%ROOT_DIR%\src\ikv.c" ^
-    "%ROOT_DIR%\src\loaders\ikv1.c" ^
-    "%ROOT_DIR%\src\loaders\ikv2.c" ^
-    -o "%TEST_EXE%"
-
-if errorlevel 1 (
-    echo unit test build failed
-    exit /b 1
-)
-
-echo built "%DEMO_EXE%"
-echo built "%TEST_EXE%"
-
-if /I "%1"=="test" (
-    "%TEST_EXE%"
-    exit /b %ERRORLEVEL%
-)
-
-if /I "%1"=="coverage" (
-    if exist "%COV_DIR%" rmdir /s /q "%COV_DIR%"
-    mkdir "%COV_DIR%"
-
-    gcc -std=c11 -Wall -Wextra -pedantic --coverage ^
-        -DIKV_TESTING ^
-        -I"%ROOT_DIR%\include" ^
-        "%~dp0unit_test.c" ^
-        "%ROOT_DIR%\src\ikv.c" ^
-        "%ROOT_DIR%\src\loaders\ikv1.c" ^
-        "%ROOT_DIR%\src\loaders\ikv2.c" ^
-        -o "%COV_EXE%"
-
-    if errorlevel 1 (
-        echo coverage build failed
-        exit /b 1
-    )
-
-    pushd "%COV_DIR%"
-    ikv_tests_cov.exe
-    if errorlevel 1 (
-        popd
-        exit /b 1
-    )
-
-    gcov -b -c ikv_tests_cov-ikv.gcno ikv_tests_cov-ikv1.gcno ikv_tests_cov-ikv2.gcno > gcov_report.txt
-    if errorlevel 1 (
-        popd
-        exit /b 1
-    )
-    popd
-
-    type "%COV_DIR%\gcov_report.txt"
-    exit /b 0
-)
-
-endlocal