Fix quotation for PATH variable in mingw tasks (#2175)

Author: eramongodb

.evergreen/generated_configs/legacy-config.yml

@@ -139,7 +139,7 @@ functions:
         set -o errexit
         # Build libmongoc with CMake and compile a program that links
         # dynamically to it, using variables from pkg-config.exe.
-        "PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
+        PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
         cmd.exe /c .\\.evergreen\\scripts\\link-sample-program-mingw.cmd
   link sample program MSVC bson:
   - command: shell.exec
@@ -166,7 +166,7 @@ functions:
         set -o errexit
         # Build libmongoc with CMake and compile a program that links
         # dynamically to it, using variables from pkg-config.exe.
-        "PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
+        PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
         cmd.exe /c .\\.evergreen\\scripts\\link-sample-program-mingw-bson.cmd
   update codecov.io:
   - command: shell.exec

.evergreen/legacy_config_generator/evergreen_config_lib/functions.py

@@ -157,7 +157,7 @@
                     r"""
                     # Build libmongoc with CMake and compile a program that links
                     # dynamically to it, using variables from pkg-config.exe.
-                    "PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
+                    PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
                     cmd.exe /c .\\.evergreen\\scripts\\link-sample-program-mingw.cmd
                     """,
                 )
@@ -186,7 +186,7 @@
                     r"""
                     # Build libmongoc with CMake and compile a program that links
                     # dynamically to it, using variables from pkg-config.exe.
-                    "PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
+                    PATH="/cygdrive/c/ProgramData/chocolatey/lib/winlibs/tools/mingw64/bin:${PATH:-}" # mingw-w64 GCC
                     cmd.exe /c .\\.evergreen\\scripts\\link-sample-program-mingw-bson.cmd
                     """,
                 )