Python: Remove unneeded mutex

The mutex may potentially block concurrent calls to
Pip::infoImpl().

Make infoImpl() a static method in cpp.

Change-Id: I06e2de08674b5669e58684743d67a569da43d662
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/python/pipsupport.cpp

@@ -143,20 +143,13 @@ Pip *Pip::instance(const FilePath &python)
     return it.value();
 }
 
-QFuture<PipPackageInfo> Pip::info(const PipPackage &package)
+static PipPackageInfo infoImpl(const PipPackage &package, const FilePath &python)
-{
-    return Utils::runAsync(&Pip::infoImpl, this, package);
-}
-
-PipPackageInfo Pip::infoImpl(const PipPackage &package)
 {
     PipPackageInfo result;
 
     QtcProcess pip;
-    pip.setCommand(CommandLine(m_python, {"-m", "pip", "show", "-f", package.packageName}));
+    pip.setCommand(CommandLine(python, {"-m", "pip", "show", "-f", package.packageName}));
-    m_lock.lock();
     pip.runBlocking();
-    m_lock.unlock();
     QString fieldName;
     QStringList data;
     const QString pipOutput = pip.allOutput();
@@ -180,6 +173,11 @@ PipPackageInfo Pip::infoImpl(const PipPackage &package)
     return result;
 }
 
+QFuture<PipPackageInfo> Pip::info(const PipPackage &package)
+{
+    return Utils::runAsync(infoImpl, package, m_python);
+}
+
 Pip::Pip(const Utils::FilePath &python)
     : QObject(PythonPlugin::instance())
     , m_python(python)

src/plugins/python/pipsupport.h

@@ -55,9 +55,6 @@ public:
 private:
     Pip(const Utils::FilePath &python);
 
-    PipPackageInfo infoImpl(const PipPackage &package);
-
-    QMutex m_lock;
     Utils::FilePath m_python;
 };