Use environment variable to determine compiler version for conan.

.drone.yml

@@ -62,6 +62,7 @@ steps:
       CXX: x86_64-w64-mingw32-g++
       STRIP: x86_64-w64-mingw32-strip
       RC: x86_64-w64-mingw32-windres
+      CONAN_ENV_COMPILER_VERSION: 9.3
     commands:
       - conan remote add epsilon-public https://packages.p-epsilon.com/
       - update-alternatives --set i686-w64-mingw32-gcc /usr/bin/i686-w64-mingw32-gcc-posix
@@ -97,6 +98,6 @@ steps:
       - conan user --clean
 ---
 kind: signature
-hmac: 112679930159db2592105125cef7d2254c740532559f8d048ae3b2ed86364d83
+hmac: ba0cd11e5fc5d2154fc5adec2cb488c828d7a50e29f621d8c9ceee42d51b1005
 
 ...

CmakeConanSetup.cmake

@@ -21,7 +21,7 @@ function(SetupConan)
         else ()
             execute_process(COMMAND conan install ${CMAKE_SOURCE_DIR} --install-folder=${CMAKE_BINARY_DIR} --build outdated
                     -s compiler=gcc
-                    -s compiler.version=9.3
+                    -s compiler.version=$ENV{CONAN_ENV_COMPILER_VERSION}
                     -s compiler.libcxx=libstdc++11
                     -s os=Windows
                     -o *:shared=True