install: use mingw-nuwen instead of stock gcc

Avoids issues with Windows builds like:
```
gcc -Os -Wall -W -Wstrict-prototypes -DNDEBUG -D_WIN32_WINNT=0x501 -Iinclude -I. -o wingenminiupnpcstrings.exe wingenminiupnpcstrings.c
process_begin: CreateProcess(NULL, gcc -Os -Wall -W -Wstrict-prototypes -DNDEBUG -D_WIN32_WINNT=0x501 -Iinclude -I. -o wingenminiupnpcstrings.exe w ingenminiupnpcstrings.c, ...) failed.
make (e=2): The system cannot find the file specified.
```
status-im/infra-nimbus#132 (comment)

Signed-off-by: Jakub Sokołowski <jakub@status.im>

tasks/install.yml

@@ -1,11 +1,13 @@
 ---
-- name: Install GCC and CMake to compile Nim
-  win_shell: 'scoop install --global gcc cmake'
+- name: Install MinGW-Nuwen and CMake to compile Nim
+  win_shell: 'scoop install --global mingw-nuwen gcc cmake'
 
 - name: Add GCC to the system wide PATH
   win_path:
     name: 'PATH'
-    elements: 'C:\ProgramData\scoop\apps\gcc\current\bin'
+    elements:
+      - 'C:\ProgramData\scoop\apps\mingw-nuwen\current\bin'
+      - 'C:\ProgramData\scoop\apps\gcc\current\bin'
     scope: 'machine'
     state: 'present'
   register: machine_path