Reduce amount of debug info injected in extension modules

sysconfig.get_config_var('CFLAGS') has '-g', which defaults to level 2

Py310 builds on linux-aarch64 require >5GB with level 2, which result
in the docker build containers getting killed on azure, where we have
only 7GB of memory. With -g1, the memory requirement decreases to <4GB

Resolves #11507

Author: nehaljwani

mypyc/build.py

@@ -513,7 +513,7 @@ def mypycify(
         cflags += [
             '-O{}'.format(opt_level), '-Werror', '-Wno-unused-function', '-Wno-unused-label',
             '-Wno-unreachable-code', '-Wno-unused-variable',
-            '-Wno-unused-command-line-argument', '-Wno-unknown-warning-option',
+            '-Wno-unused-command-line-argument', '-Wno-unknown-warning-option', '-g1'
         ]
         if 'gcc' in compiler.compiler[0] or 'gnu-cc' in compiler.compiler[0]:
             # This flag is needed for gcc but does not exist on clang.