remove -Wctor-dtor-privacy for soplex

- soplex seems to have decided to include the fmt library
- when compiling lpi_spx2, the fmt header (included by soplex.h) needs to
  be compiled now
- however, fmt headers generate ctor-dtor-privacy warning
- as in integer/soplex@d377249db958aa16a6e539bbc1324188066c877f, this
  change removes checking for this warning

CMakeLists.txt

@@ -254,7 +254,7 @@ endif()
 # if changing these flags, also update GCCWARN/GXXWARN in make/make.project
 set(ADD_C_AND_CXX_FLAGS -pedantic -Wall -W -Wpointer-arith -Wcast-align -Wwrite-strings -Wshadow  -Wredundant-decls -Wdisabled-optimization -Wno-long-long -Wno-unknown-pragmas -Wno-unused-parameter)
 set(ADD_C_FLAGS -Wsign-compare -Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes -Wno-override-init -Wno-uninitialized -Wno-maybe-uninitialized)
-set(ADD_CXX_FLAGS -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -Wsynth -Wcast-qual -Wno-strict-overflow -Wno-psabi)
+set(ADD_CXX_FLAGS -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -Wsynth -Wcast-qual -Wno-strict-overflow -Wno-psabi)
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 # clang specific suppressions

make/make.project

@@ -244,7 +244,7 @@ GXXWARN = -pedantic -Wall -W
 GCCWARN += -Wpointer-arith -Wcast-align -Wwrite-strings -Wshadow -Wredundant-decls -Wdisabled-optimization \
            -Wsign-compare -Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes
 GXXWARN += -Wpointer-arith -Wcast-align -Wwrite-strings -Wshadow -Wredundant-decls -Wdisabled-optimization \
-           -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -Wsynth -Wcast-qual
+           -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -Wsynth -Wcast-qual
 
 # disable some warning that would be too much effort to fix, disfigure the code, or produce too many false positive
 GCCWARN += -Wno-long-long -Wno-unknown-pragmas -Wno-unused-parameter -Wno-override-init -Wno-uninitialized -Wno-maybe-uninitialized