cmake: quotes, whitespace, use VERSION_GREATER_EQUAL

- `NOT` + `VERSION_LESS` -> `VERSION_GREATER_EQUAL`
  Available since 3.7, which is the minimum required for curl:
  https://cmake.org/cmake/help/latest/command/if.html#version-greater-equal
- make `CMAKE_REQUIRED_*` argument quotes consistent.
- make `CMAKE_REQUIRED_*` space alignment consistent.
- drop quote from version value for consistency with other cases.
- formatting

Closes #17002

src/CMakeLists.txt

@@ -90,10 +90,7 @@ add_executable(
 )
 target_compile_definitions(${EXE_NAME} PRIVATE ${_curl_definitions})
 
-add_executable(
-  ${PROJECT_NAME}::${EXE_NAME}
-  ALIAS ${EXE_NAME}
-)
+add_executable(${PROJECT_NAME}::${EXE_NAME} ALIAS ${EXE_NAME})
 
 add_library(
   curltool  # special libcurltool library just for unittests