boringssl.sh: revert custom CPPFLAGS that did not work

boringssl.sh

@@ -66,7 +66,6 @@ _VER="$1"
   [ "${CW_DEV_INCREMENTAL:-}" != '1' ] && rm -r -f "${_PKGDIR:?}" "${_BLDDIR:?}"
 
   CFLAGS="-ffile-prefix-map=$(pwd)="
-  CPPFLAGS=''
   LIBS='-lpthread'  # for tests
   options=''
 
@@ -108,8 +107,6 @@ _VER="$1"
       options+=' -DDISABLE_GO=ON'
       options+=' -DDISABLE_PERL=ON'
 
-      CPPFLAGS+=' -Wno-cast-function-type'
-
       # Patch out to avoid redefinition errors
       sed -i.bak 's/-D_WIN32_WINNT=_WIN32_WINNT_WIN7//g' ./CMakeLists.txt
     else
@@ -130,8 +127,8 @@ _VER="$1"
     # shellcheck disable=SC2086
     cmake -B "${_BLDDIR}" ${_CMAKE_GLOBAL} ${_CMAKE_CXX_GLOBAL} ${options} \
       '-DBUILD_SHARED_LIBS=OFF' \
-      "-DCMAKE_C_FLAGS=${_CFLAGS_GLOBAL_CMAKE} ${_CFLAGS_GLOBAL} ${_CPPFLAGS_GLOBAL} ${CFLAGS} ${CPPFLAGS} ${_LDFLAGS_GLOBAL} ${LIBS}" \
-      "-DCMAKE_CXX_FLAGS=${_CFLAGS_GLOBAL_CMAKE} ${_CFLAGS_GLOBAL} ${_CPPFLAGS_GLOBAL} ${CFLAGS} ${CPPFLAGS} ${_LDFLAGS_GLOBAL} ${LIBS} ${_CXXFLAGS_GLOBAL} ${_LDFLAGS_CXX_GLOBAL}"
+      "-DCMAKE_C_FLAGS=${_CFLAGS_GLOBAL_CMAKE} ${_CFLAGS_GLOBAL} ${_CPPFLAGS_GLOBAL} ${CFLAGS} ${_LDFLAGS_GLOBAL} ${LIBS}" \
+      "-DCMAKE_CXX_FLAGS=${_CFLAGS_GLOBAL_CMAKE} ${_CFLAGS_GLOBAL} ${_CPPFLAGS_GLOBAL} ${CFLAGS} ${_LDFLAGS_GLOBAL} ${LIBS} ${_CXXFLAGS_GLOBAL} ${_LDFLAGS_CXX_GLOBAL}"
   fi
 
   cmake --build "${_BLDDIR}"  # --verbose