ci: Use Rust 1.49 as the default toolchain

Fixes gccrs#3569

ChangeLog:

	* .github/workflows/ccpp.yml: Switch to Rust 1.49.
	* .github/workflows/ccpp32alpine.yml: Likewise.

Author: CohenArthur

.github/workflows/ccpp.yml

@@ -42,7 +42,7 @@ jobs:
                   g++-multilib \
                   dejagnu;
           # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
     - name: Make Source Read-Only
       run: chmod -R a-w ./*
@@ -127,7 +127,7 @@ jobs:
                   g++-multilib \
                   dejagnu;
           # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
     - name: Make Source Read-Only
       run: chmod -R a-w ./*
@@ -212,7 +212,7 @@ jobs:
                   g++-multilib \
                   dejagnu;
           # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
     - name: Make Source Read-Only
       run: chmod -R a-w ./*
@@ -295,7 +295,7 @@ jobs:
                   build-essential \
                   dejagnu;
           # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
     - name: Restore cached gcc-5.4
       id: restore-gcc5
@@ -384,7 +384,7 @@ jobs:
   #     run: |
   #         brew install dejagnu mpfr libmpc gmp;
   #         # install Rust directly using rustup
-  #         curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+  #         curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
   #   - name: Make Source Read-Only
   #     run: chmod -R a-w ./*
@@ -456,7 +456,7 @@ jobs:
                   g++-multilib \
                   dejagnu;
           # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0;
 
     - name: Make Source Read-Only
       run: chmod -R a-w ./*

.github/workflows/ccpp32alpine.yml

@@ -50,7 +50,7 @@ jobs:
     #     sudo apt install gcc-multilib g++-multilib libc6-dev-i386
     # - name: Install Rust
     #   run: |
-    #     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0 
+    #     curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.49.0 
     #   shell: alpine.sh {0}
 
     - name: Install dependencies with gcc