poppler: fix incorrect GCC_VERSION check

The minor version is encoded into the last 2 digits, the micro version
is not avialable.

Change-Id: I4eee40511d732ec8cfc8d85943b965bb6e06d66e
Reviewed-on: https://gerrit.libreoffice.org/56380Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Jenkins

external/poppler/StaticLibrary_poppler.mk

@@ -34,11 +34,12 @@ $(eval $(call gb_StaticLibrary_add_cxxflags,poppler,\
 endif
 
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58864
+# can't easily check for 4.8.2 exactly so just apply to GCC 4.8.x
 ifeq ($(COM),GCC)
 ifeq ($(COM_IS_CLANG),)
 ifeq ($(CPUNAME),INTEL)
-ifeq ($(shell expr '$(GCC_VERSION)' '<' 483),1)
-ifeq ($(shell expr '$(GCC_VERSION)' '>=' 480),1)
+ifeq ($(shell expr '$(GCC_VERSION)' '<' 409),1)
+ifeq ($(shell expr '$(GCC_VERSION)' '>=' 408),1)
 $(eval $(call gb_StaticLibrary_add_cxxflags,poppler,\
 	-march=i586 \
 ))