Bump libc from 0.2.48 to 0.2.49

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.48 to 0.2.49.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](https://github.com/rust-lang/libc/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

programs/native/bpf_loader/Cargo.toml

@@ -16,7 +16,7 @@ bpf_rust = []
 bincode = "1.1.2"
 byteorder = "1.3.1"
 elf = "0.0.10"
-libc = "0.2.48"
+libc = "0.2.49"
 log = "0.4.2"
 solana_rbpf = "=0.1.9"
 serde = "1.0.88"

programs/native/native_loader/Cargo.toml

@@ -10,7 +10,7 @@ edition = "2018"
 
 [dependencies]
 bincode = "1.1.2"
-libc = "0.2.48"
+libc = "0.2.49"
 libloading = "0.5.0"
 log = "0.4.2"
 solana-sdk = { path = "../../../sdk", version = "0.12.0" }