GlibcRequirement: Fix for 32-bit Linuxbrew
GlibcRequirement: Fix for 32-bit Linuxbrew

Fix Unable to locate the system's glibc
Add /lib/libc.so.6 to the list of paths to search for libc.

Closes Linuxbrew/linuxbrew#905

hanxue/linuxbrew,hanxue/linuxbrew,hanxue/linuxbrew,Linuxbrew/brew,maxim-belkin/brew,maxim-belkin/brew,Linuxbrew/brew,Linuxbrew/brew,rwhogg/brew,rwhogg/brew,rwhogg/brew,Linuxbrew/brew,maxim-belkin/brew