configure: Add -lstdc++ to the requirements for linking with libgme.

Needed for cross-compiling with MinGW-w64

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -4175,7 +4175,7 @@ enabled libfdk_aac        && require libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen
 flite_libs="-lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal -lflite_cmu_us_kal16 -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish -lflite_cmulex -lflite"
 enabled libflite          && require2 libflite "flite/flite.h" flite_init $flite_libs
 enabled libfreetype       && require_pkg_config freetype2 "ft2build.h freetype/freetype.h" FT_Init_FreeType
-enabled libgme            && require  libgme gme/gme.h gme_new_emu -lgme
+enabled libgme            && require  libgme gme/gme.h gme_new_emu -lgme -lstdc++
 enabled libgsm            && { for gsm_hdr in "gsm.h" "gsm/gsm.h"; do
                                    check_lib "${gsm_hdr}" gsm_create -lgsm && break;
                                done || die "ERROR: libgsm not found"; }