Fix for cygwin
Fix for cygwin

math.h includes fabs() etc. in the global namespace, but cmath does
not.  And as long as we're forced to fix that anyway, who the heck
still uses non-templated abs() with C++?

friedmud/libmesh,dknez/libmesh,hrittich/libmesh,pbauman/libmesh,coreymbryant/libmesh,90jrong/libmesh,roystgnr/libmesh,cahaynes/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,jiangwen84/libmesh,permcody/libmesh,karpeev/libmesh,jwpeterson/libmesh,roystgnr/libmesh,dmcdougall/libmesh,90jrong/libmesh,cahaynes/libmesh,90jrong/libmesh,permcody/libmesh,jwpeterson/libmesh,markcmiller86/libmesh_silo,dmcdougall/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,salazardetroya/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,libMesh/libmesh,friedmud/libmesh,pbauman/libmesh,karpeev/libmesh,jwpeterson/libmesh,Mbewu/libmesh,aeslaughter/libmesh,cahaynes/libmesh,coreymbryant/libmesh,karpeev/libmesh,dknez/libmesh,roystgnr/libmesh,friedmud/libmesh,cahaynes/libmesh,jwpeterson/libmesh,cahaynes/libmesh,aeslaughter/libmesh,benkirk/libmesh,jwpeterson/libmesh,90jrong/libmesh,hrittich/libmesh,Mbewu/libmesh,giorgiobornia/libmesh,Mbewu/libmesh,Mbewu/libmesh,friedmud/libmesh,karpeev/libmesh,Mbewu/libmesh,aeslaughter/libmesh,90jrong/libmesh,jiangwen84/libmesh,benkirk/libmesh,jwpeterson/libmesh,hrittich/libmesh,capitalaslash/libmesh,jiangwen84/libmesh,capitalaslash/libmesh,dknez/libmesh,salazardetroya/libmesh,dknez/libmesh,balborian/libmesh,karpeev/libmesh,aeslaughter/libmesh,markcmiller86/libmesh_silo,dschwen/libmesh,90jrong/libmesh,coreymbryant/libmesh,dmcdougall/libmesh,balborian/libmesh,giorgiobornia/libmesh,Mbewu/libmesh,pbauman/libmesh,dknez/libmesh,jiangwen84/libmesh,salazardetroya/libmesh,BalticPinguin/libmesh,dmcdougall/libmesh,jiangwen84/libmesh,pbauman/libmesh,coreymbryant/libmesh,balborian/libmesh,dschwen/libmesh,coreymbryant/libmesh,capitalaslash/libmesh,giorgiobornia/libmesh,salazardetroya/libmesh,dschwen/libmesh,giorgiobornia/libmesh,dschwen/libmesh,90jrong/libmesh,permcody/libmesh,dknez/libmesh,hrittich/libmesh,Mbewu/libmesh,markcmiller86/libmesh_silo,benkirk/libmesh,libMesh/libmesh,coreymbryant/libmesh,balborian/libmesh,dmcdougall/libmesh,permcody/libmesh,Mbewu/libmesh,dschwen/libmesh,libMesh/libmesh,hrittich/libmesh,karpeev/libmesh,pbauman/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,friedmud/libmesh,markcmiller86/libmesh_silo,friedmud/libmesh,dknez/libmesh,pbauman/libmesh,libMesh/libmesh,giorgiobornia/libmesh,hrittich/libmesh,pbauman/libmesh,jiangwen84/libmesh,hrittich/libmesh,capitalaslash/libmesh,salazardetroya/libmesh,90jrong/libmesh,libMesh/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,libMesh/libmesh,balborian/libmesh,aeslaughter/libmesh,permcody/libmesh,cahaynes/libmesh,BalticPinguin/libmesh,markcmiller86/libmesh_silo,dschwen/libmesh,dknez/libmesh,libMesh/libmesh,svallaghe/libmesh,benkirk/libmesh,roystgnr/libmesh,benkirk/libmesh,balborian/libmesh,90jrong/libmesh,giorgiobornia/libmesh,jiangwen84/libmesh,permcody/libmesh,aeslaughter/libmesh,dschwen/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,markcmiller86/libmesh_silo,pbauman/libmesh,markcmiller86/libmesh_silo,svallaghe/libmesh,friedmud/libmesh,benkirk/libmesh,jiangwen84/libmesh,capitalaslash/libmesh,permcody/libmesh,Mbewu/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,salazardetroya/libmesh,friedmud/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,salazardetroya/libmesh,karpeev/libmesh,vikramvgarg/libmesh,balborian/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,aeslaughter/libmesh,aeslaughter/libmesh,aeslaughter/libmesh,dmcdougall/libmesh,dschwen/libmesh,hrittich/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,cahaynes/libmesh,vikramvgarg/libmesh,karpeev/libmesh,coreymbryant/libmesh,markcmiller86/libmesh_silo,vikramvgarg/libmesh,svallaghe/libmesh,balborian/libmesh,pbauman/libmesh,benkirk/libmesh,dmcdougall/libmesh,permcody/libmesh,hrittich/libmesh,svallaghe/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,balborian/libmesh,balborian/libmesh,friedmud/libmesh,benkirk/libmesh,dmcdougall/libmesh,cahaynes/libmesh,benkirk/libmesh,libMesh/libmesh,salazardetroya/libmesh,BalticPinguin/libmesh