chore(deps): bump libc from 0.2.48 to 0.2.49

Created by: dependabot-preview[bot]

Bumps libc from 0.2.48 to 0.2.49.

Commits

• 68701e7 Auto merge of #1274 - gnzlbg:clean_libctest_apple, r=gnzlbg
• f5cbdbc Clean libc-test for apple targets
• 400372d Auto merge of #1270 - gnzlbg:no_extern_std, r=gnzlbg
• 8c571e0 Auto merge of #1269 - gnzlbg:fix_cp_pub, r=gnzlbg
• 61aeeda Do not import the std library with use_std
• 8eb5066 Unnecessary pub use when private module use is available
• fecc1fd Auto merge of #1268 - alexcrichton:fix-features, r=gnzlbg
• 5049a97 Fix build of rustc-dep-of-std feature
• 577fdc8 Auto merge of #1248 - Ralith:flowinfo, r=gnzlbg
• dda8505 Fix broken links in README
• Additional commits viewable in compare view

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