flag-o-matic.eclass: Revert "Strip LDFLAGS unsupported by the C..."

The current logic strips too much, causing build failures. Revert it
until we get it right.

Bug: https://bugs.gentoo.org/627474

eclass/flag-o-matic.eclass

@@ -535,9 +535,6 @@ strip-unsupported-flags() {
 	export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
 	export FFLAGS=$(test-flags-F77 ${FFLAGS})
 	export FCFLAGS=$(test-flags-FC ${FCFLAGS})
-	# note: this does not verify the linker flags but it is enough
-	# to strip invalid C flags which are much more likely, #621274
-	export LDFLAGS=$(test-flags-CC ${LDFLAGS})
 }
 
 # @FUNCTION: get-flag

eclass/tests/flag-o-matic.sh

@@ -55,7 +55,7 @@ done <<<"
 
 tbegin "strip-unsupported-flags"
 strip-unsupported-flags
-[[ ${CFLAGS} == "" ]] && [[ ${CXXFLAGS} == "-z=2" ]] && [[ ${LDFLAGS} == "" ]]
+[[ ${CFLAGS} == "" ]] && [[ ${CXXFLAGS} == "-z=2" ]]
 ftend
 
 for var in $(all-flag-vars) ; do