Add documentation for pkg-config in cross-compilation settings
Add documentation for pkg-config in cross-compilation settings

gianricardo/googletest,empiredan/googletest,google/googletest,antidotcb/googletest,antidotcb/googletest,gianricardo/googletest,google/googletest,gianricardo/googletest,antidotcb/googletest,google/googletest,antidotcb/googletest,empiredan/googletest,google/googletest,empiredan/googletest