cc_configure: add -lm to the default linker flags
cc_configure: add -lm to the default linker flags

Some C++ toolchain requires -lm when passing -lstdc++.
Always add it.

We should probably make that depend on what kind of
binary we actually want to build but that's beyond the
scope of cc_configure.

Fixes #1190.

--
MOS_MIGRATED_REVID=121015578

davidzchen/bazel,twitter-forks/bazel,damienmg/bazel,cushon/bazel,perezd/bazel,cushon/bazel,ulfjack/bazel,bazelbuild/bazel,safarmer/bazel,variac/bazel,hermione521/bazel,zhexuany/bazel,variac/bazel,werkt/bazel,bazelbuild/bazel,mrdomino/bazel,hermione521/bazel,katre/bazel,ulfjack/bazel,dslomov/bazel-windows,ulfjack/bazel,mrdomino/bazel,safarmer/bazel,twitter-forks/bazel,iamthearm/bazel,UrbanCompass/bazel,ButterflyNetwork/bazel,aehlig/bazel,dslomov/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,dropbox/bazel,perezd/bazel,dslomov/bazel,werkt/bazel,meteorcloudy/bazel,meteorcloudy/bazel,werkt/bazel,dropbox/bazel,Asana/bazel,kchodorow/bazel-1,variac/bazel,akira-baruah/bazel,kchodorow/bazel,werkt/bazel,Asana/bazel,juhalindfors/bazel-patches,dslomov/bazel,twitter-forks/bazel,davidzchen/bazel,davidzchen/bazel,katre/bazel,mrdomino/bazel,kchodorow/bazel-1,aehlig/bazel,kchodorow/bazel-1,katre/bazel,dslomov/bazel-windows,cushon/bazel,LuminateWireless/bazel,bazelbuild/bazel,kchodorow/bazel,mikelalcon/bazel,iamthearm/bazel,spxtr/bazel,mikelalcon/bazel,zhexuany/bazel,snnn/bazel,abergmeier-dsfishlabs/bazel,dslomov/bazel,spxtr/bazel,variac/bazel,ButterflyNetwork/bazel,LuminateWireless/bazel,dropbox/bazel,ulfjack/bazel,ulfjack/bazel,damienmg/bazel,snnn/bazel,davidzchen/bazel,davidzchen/bazel,abergmeier-dsfishlabs/bazel,mbrukman/bazel,mikelikespie/bazel,Asana/bazel,LuminateWireless/bazel,mbrukman/bazel,meteorcloudy/bazel,mbrukman/bazel,spxtr/bazel,snnn/bazel,LuminateWireless/bazel,UrbanCompass/bazel,mikelikespie/bazel,snnn/bazel,cushon/bazel,mikelalcon/bazel,meteorcloudy/bazel,mikelalcon/bazel,perezd/bazel,iamthearm/bazel,meteorcloudy/bazel,kchodorow/bazel-1,meteorcloudy/bazel,snnn/bazel,twitter-forks/bazel,iamthearm/bazel,spxtr/bazel,juhalindfors/bazel-patches,spxtr/bazel,aehlig/bazel,akira-baruah/bazel,snnn/bazel,abergmeier-dsfishlabs/bazel,aehlig/bazel,UrbanCompass/bazel,aehlig/bazel,hermione521/bazel,akira-baruah/bazel,damienmg/bazel,katre/bazel,spxtr/bazel,cushon/bazel,mikelikespie/bazel,akira-baruah/bazel,juhalindfors/bazel-patches,dslomov/bazel,mikelikespie/bazel,davidzchen/bazel,safarmer/bazel,variac/bazel,damienmg/bazel,twitter-forks/bazel,bazelbuild/bazel,dropbox/bazel,snnn/bazel,mbrukman/bazel,hermione521/bazel,UrbanCompass/bazel,perezd/bazel,variac/bazel,mbrukman/bazel,hermione521/bazel,zhexuany/bazel,Asana/bazel,variac/bazel,mbrukman/bazel,iamthearm/bazel,kchodorow/bazel,dropbox/bazel,twitter-forks/bazel,mrdomino/bazel,damienmg/bazel,damienmg/bazel,mikelalcon/bazel,juhalindfors/bazel-patches,LuminateWireless/bazel,dslomov/bazel-windows,UrbanCompass/bazel,dslomov/bazel-windows,dslomov/bazel,werkt/bazel,abergmeier-dsfishlabs/bazel,cushon/bazel,LuminateWireless/bazel,ButterflyNetwork/bazel,iamthearm/bazel,ulfjack/bazel,abergmeier-dsfishlabs/bazel,zhexuany/bazel,meteorcloudy/bazel,mrdomino/bazel,hermione521/bazel,abergmeier-dsfishlabs/bazel,damienmg/bazel,zhexuany/bazel,juhalindfors/bazel-patches,dslomov/bazel,akira-baruah/bazel,Asana/bazel,spxtr/bazel,davidzchen/bazel,dslomov/bazel-windows,safarmer/bazel,akira-baruah/bazel,twitter-forks/bazel,perezd/bazel,kchodorow/bazel-1,mrdomino/bazel,perezd/bazel,Asana/bazel,perezd/bazel,ButterflyNetwork/bazel,Asana/bazel,mikelikespie/bazel,ulfjack/bazel,UrbanCompass/bazel,safarmer/bazel,kchodorow/bazel,zhexuany/bazel,mikelikespie/bazel,mikelalcon/bazel,bazelbuild/bazel,juhalindfors/bazel-patches,aehlig/bazel,aehlig/bazel,safarmer/bazel,katre/bazel,katre/bazel,kchodorow/bazel-1,bazelbuild/bazel,juhalindfors/bazel-patches,dslomov/bazel-windows,dropbox/bazel,kchodorow/bazel,kchodorow/bazel,werkt/bazel,kchodorow/bazel