Remove PPC_FMT_FLAGS setting from libenvpp.cmake (learning-process#569)

Author: aobolensk

cmake/libenvpp.cmake

@@ -1,9 +1,3 @@
-if(WIN32)
-  set(PPC_FMT_FLAGS "/EHsc /DFMT_CONSTEVAL=inline")
-else()
-  set(PPC_FMT_FLAGS "-fexceptions -DFMT_CONSTEVAL=inline")
-endif()
-
 include(ExternalProject)
 ExternalProject_Add(
   ppc_libenvpp
@@ -17,7 +11,6 @@ ExternalProject_Add(
              -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
              -DCMAKE_CXX_STANDARD_REQUIRED=ON
              -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-             -DCMAKE_CXX_FLAGS=${PPC_FMT_FLAGS}
              -DLIBENVPP_TESTS=OFF
              -DLIBENVPP_EXAMPLES=OFF
   BUILD_COMMAND